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[探索发现] 【整理】2010-02-07 地球的起源 EarthMade—4

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[探索发现] 【整理】2010-02-07 地球的起源 EarthMade—4

本帖最后由 sylvia_qian 于 2010-2-8 23:02 编辑

 

  How The Earth Was Made  

The series of HOW THE EARTH WAS MADE travels the globe to reveal the geological processes that have shaped our planet. We will look at a single location and examine how the features that we see today have formed over millions of years—whether by colliding continents, volcanic eruption or the abrasive power of vast ice sheets. These processes, which intimately affect the way we live today, have been lost in the mists of time. Using the clues that were left behind, combined with expert evidence from geologists in the field, this series rolls back the millennia to see how the slow but immensely powerful forces of geology have shaped our world.

 

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【整理】sylvia_qian

For reference only

 

The answer lies not in climate patters but in geology. The entire African continent is underpinned by a giant piece of the earth crust. It’s called a tectonic plate, and 40 million years ago in what is known as the Eocene Age, it was on the move.

 

-So, at Wadi Al-Hitan we have whale swimming around in this Eocene Ocean, all the while the African plate is moving to the north. 

Africa, collides with Europe, closing the Tethys Sea, but the African plate keeps moving.

 

-So we uplifted the northern part of Africa, and so the Tethys Sea recedes and we’ve got this whole area of North Africa now emerge, it’s out on land. 

The whales of Wadi Al-Hitan are cut off and trapped, smaller and smaller pools of water. The deadly Sahara has claimed its first victims.

 

In the quest to discover the history of the vast Sahara Desert, geologists have so far uncovered two important clues: sea fossils in the Great Pyramids of Egypt show these building blocks were once under water; whale bones reveal that a sea submerged much of the Sahara 37 million years ago. As the forces of plate tectonics push the Sahara out from under the sea, it created a tropical swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth, but the clues to this mystery turn out to be hidden in the last place anyone expected.

 

20 million years ago, the Sahara Desert was a lush tropical swamp. Geologists are now piecing together the story of the next 20 million years. Today, the Sahara lies in what is known as the desert belt, a region of dry air north of the equator. Here, strong winds clear the sky of clouds and dry out the land below. It stretches through the Gobi Desert in China and across the deserts of the southwestern United States. The Sahara is the largest and yet geologists know next to nothing about when it was created.

 

-What we have are just these little bits and pieces these snapshots of what the Sahara was like, because the wind blows away a lot of our record and what isn’t blown away is often covered by sand, so it’s kinda hard to find the rocks we need to tell the story we are trying to tell.


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The answer lies not in climate patterns,but in geology,the entire African continent is underpinned by a giant piece of the earth's crust.It's called a tectonic plate,and 40 million years ago,in what is known as the Eocene,it was on the move.So everybody on here tent?,we have whales swimming around this Eocene ocean,all the while the African plate is moving to the North,Africa,collides with Europe,closing the Tethys sea,but the African plate keeps moving,so we uplifted the northern part of Africa,and so the Tethys sea recedes,we got this whole area of North Africa now emerged out on land,the whales of Wadi ouhertown? are cut off and trapped in smaller and smaller pools of water,the deadly Saharah has claimed its first victims.In the quest to discover the history of the vast Saharah desert,geologists have so far uncovered two important clues,sea fossils in the great pyramids in Egypt show these building blocks were once underwater,whale bones revealed that a sea submerged much of the Saharah 37 million years ago,as the forces of plate tectonics pushed the Saharah out from under the sea,it created a tropical swamp,in order to figure out what made it into the wasteland visible today.Scientists have to pinpoint the moment of its birth,but the clues to this mystery turned out to be hidden in the last  place anyone expected.20 million years ago,the Sahara was a large tropical swamp,geologists are now piecing together the stories of the next 20 million years,today the Sahara lies in what is know as the Desert Belt,a region of dry air north of the equator,her stong winds clear the sky of clouds and dry out the land below,it stretches through the Gobi desert in China and crosses the deserts of the Southwestern United States,the Sahara is the largest,yet  geologists know next to nothing about when it was created.What we have are just these little bits,the pieces,the snapshots of what Sahara was like,because the wind blows away a lof of our record,and what isn't blown away is often covered by sand so it's kind of hard to find the rocks we need to tell the story we've tried to tell.
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Homework

The answer lies not in climate patters but in geology. The entire Africa continent is underpinned by a giant piece of the earth crust. It’s called a titanic plate, and 40 million years ago in what is know as the Y** Age, it was on the move.

-So, at the // we have well-assuming around the Y** Ocean, all the whale the Africa plate is moving to the north.

Africa, collies with Europe, closing the Tethys Sea, but the African plate keeps moving.

-So we u** lifted the northern part of Africa, and so the Tethys Sea recedes and we’ve got the whole area of North Africa now in merge, it’s out on land.

The whales of Wadi Al-Hitan are cut off and trapped, smaller and smaller pools of water. The deadly Sahara has claimed its first victims.

In the quest discovery the history of the vast Sahara, geologists have so far uncovered two important clues: sea fossils in the Great Pyramids of Egypt show these building blocks were once under water; whale bones reveal that the sea submerged much of the Sahara 37 million years ago. As the forces of plate titanic push the Sahara out from under the sea, it created a tropic swan. In order to figure what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth, but the clues to this mystery turn out to be hidden in last place anywhere expected.

20 million years ago, the Sahara Desert was a lash tropic swan. Geologists are now piecing together of the story of the next 20 million years. Today, the Sahara lies in what is known as the desert belt, a regional dry area north of the equator. Here, strong winds clear the sky of clouds and dry out the land below. It stretches through the Gebi Desert in China and cross the deserts of the Southwestern United States. The Sahara is the largest and yet geologists know next to nothing about when it was created.

-What we have are just these little bits and pieces the snap shots what the Sahara was like because the wind blows away a lot of record and what isn’t blown away is often covered by sand, so it’s kinda hard to find the rocks we need to tell the story we are trying to tell.
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本帖最后由 仪子 于 2010-2-7 11:06 编辑

Homework

   The answer lies not in climate pattern but in geology. The entire African continent is underpinned by a gaint piece of earth's crust, it’s called a tectonic plate,and  40 million years ago in what is known as the Eocene age. It was on the move.
   
     So everywhere in Halfa town, we have whales swimming around  in this Eocene ocean. All the while the African plate is moving to the North. Africa,collides with Europe,closing the Tethys sea, but the African plate keeps moving. So we uplifted the northern part of Africa, and so the Tethys sea recedes, and we've got this whole area of North Africa now emerged ,it is out on land. The whales of Wadi Halfa town are cut off and trapped in smaller and smaller pools of water, the deadly Saharah has claimed its first victims. In the quest to discover the history of the vast Saharah desert, geologists have so far uncovered two important clues,sea fossils in the great pyramids in Egypt show these building blocks were once underwater, whale bones reveal that a sea submerged much of the Saharah 37 million years ago. As the forces of plate tectonics pushed the Sahara out from under the sea, it created a tropical swamp.

      In order to figure out what made it into the wasteland visible today, Scientists have to pinpoint the moment of its birth,but the clues to this mystery turned out to be hidden in the last  place anyone expected. Twenty million years ago, the Sahara desert was a lush tropical swamp, geologists are now piecing together the stories of the next 20 million years. Today the Sahara lies in what is know as the desert belt, a region of dry air, north of the equator,here strong winds clear the sky of clouds and dry out the land below, it stretches through the Gobi desert in China and crosses the deserts of the Southwestern United States. The Sahara is the largest, and yet  geologists know next to nothing about when it was created. What we have are just these little bits,the pieces,the snapshots of what Sahara was like,because the wind blows away a lot of our record,and what isn't blown away is often covered by sand,  so it's kind of hard to find the rocks we need to tell the story we were trying to tell.
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The answer lies not in climate patterns but in geology. The entire African continent is underpinned by a giant piece of the earth’s crust. It’s called a tectonic plate and 40 million years ago in what is known as the Eocene age. It was on the move.

So at / we have whales swimming around in this Eocene ocean. All the wild the African plate is moving to the north. Africa collides with Europe closer the Tethys but the African plate keeps moving. So we uplift the northern part of Africa and so the Tethys recedes and we’ve got this whole area of northern Africa now emerge. It’s out on land.

The whales of / are cut off and trapped in smaller and smaller pools of water. The deadly Sahara has claimed its first victims. In the quest to discover the history of the vast Sahara desert geologists have so far undercover two important clues. Sea fossils in the great pyramids of Egypt show these building blocks were once underwater. Whales bones revealed that the sea submerged much of the Sahara 37 million years ago.

As the forces of plate tectonics pushed the Sahara out from under the sea it created a tropical swamp. In order to figure it out what made it into the wasteland visible today scientists have to pinpoint the moment of it birth but the clues to this mystery turn out to be hidden in the last place anyone expected.

20 millions years ago the Sahara desert was a lush tropical swamp. Geologists are now piecing together the story of the next 20 million years. Today the Sahara lies in what is known as the desert belt, a region of dry air north of the equator. Here strong winds clear the sky of clouds and dry out the land below. Its stretches through the Gobi desert in China and cross the deserts of the southwestern Untied States. The Sahara is the largest and yet geologists know next to nothing about when it was created.

What we have are just these little bits and pieces these snap shots of what the Sahara was like because the wind blows away a lot of our record and what isn’t blown is often covered by sand so it’s kinda hard to find the rocks we need to tell the story we’re trying to tell.





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Homework

The answer lies not in climate pattern but in geology.

The entire African continent is underpinned by a giant piece of the earth crust. It’s called a tectonic plate and 40 million years ago in what is known as the year Sinian age it was on the move.

We have well assuming around this Sinian ocean all the while the African plate is moving to the north. Africa collides with Europe close the Tethys sea but the African plate keeps moving.

So we uplifted the northern part of Africa as of Tethys sea recedes and we’ve got this whole area of North African now immerged it’s out on land.

The whales of walding are cut off and trapped smaller and smaller pools of water. The deadly Sahara has claimed its first victims.

In the quest of discovery of history of the vast Sahara desert geologists have so far uncovered two important clues. Sea fossils in the Great Pyramid of Egypt show its building blocks were once under water. Whale bones reveal that the sea submerged much of the Sahara 37 million years ago.

As the forces of plate tectonics push the Sahara out from under the sea it created a tropical swamp.
In order to figure out what made it into the waste land visible today scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place anyone expected.

20 million years ago the Sahara desert was a lush tropical swamp. Geologists are now piecing together the story of next 20 million years. Today the Sahara lies in what is known as the desert belt a region of dry air north of the equator. Here strong winds clear the sky off
clouds and dry out the land below. It stretches through the Gobi desert in China and across the desert of the southwestern United States. The Sahara is the largest and yet geologists know next to nothing about when it was created.


What we have are just a little bits and pieces of the snapshots of what the Sahara was like, because the wind blows away a lot of our record and wasn’t blowed away it often covered by sands so it kind of hard to find the rocks we need to tell the story we are trying to tell.


[Homework]2010-02-07 地球的起源 EarthMade—4

The answer lies not in climate patterns, but in geology. The entire African continent is underpined by a giant piece of the earth crust. It's called a tectonic plate. And 40 million years ago, in what is known as the Eocene Age, it was on the move. So at Wadi Al-Hitan, we have whales swimming around in this Eocene ocean. All the wild, the African plate is moving to the north. Africa collides with Europe. Close it, the Tethys Sea. But the African plate keeps moving. So we uplifted the northern part of Africa, and so the Tethys Sea recedes. And we got this whole area of North Afica now emerged. It's out on land The whales of Wadi Al-Hitan are cut off and trapped, smaller and smaller in pools of water.
    The deadly Sahara has claimed its first victims. In the quest to discover the history of the vast Sahara Desert, geologists have so far uncovered two important clues: Sea fossils in the Great Pyramids of Egypt show these building blocks were once under water. Whale bones reveal that the sea submerged much of the Sahara 37 million years ago. As the forces of plate tectonics pushed the Sahara out from under the sea, it created a tropical swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place anyone expected. 20 million years ago, the Sahara Desert was a lush tropical swamp, geologists are now piecing together the story of the next 20 million years. Today the Sahara lies in what is known as the desert belt, a region of dry air north of the equator. Here strong winds clear the sky of clouds and dry out the land below. It streches through the Gobi Desert in China and across the deserts of the Southwestern United States. The Sahara is the largest and yet geologists know next to nothing about when it was created. What we have are just these little bits and pieces, these snap shots of what the Sahara was like. Because the wind blows away a lot of our record and what isn't blown is ofen covered by sand, so it's kinda hard to find the rocks we need to tell the story we are trying to tell.


This post was generated by put listening repetition system,  Check the original dictation thread!
实现无障碍英语沟通

[Homework]2010-02-07 地球的起源 EarthMade—4

The answer lies not in climate patterns, but in geology. The entire Africa continent is underpinned by a giant piece of the earth's crust,it's called a tectonic plate, and 40 million years ago, in what is known as the Eocene age,it was on the move.so at Wadi Al-Hitan, we have whalesswimming around in this Eocene ocean. All the while, the African plate ismoving to the north.
Africa collides with Europe. Close in the Tethys Sea. But theAfrican plate keeps moving.
So we uplifted the northern part of Africa, and so the Tethys Sea recedes.And we got this whole area of North Africa now emerged. It's out on land.
Thewhales of Wadi Al-Hitan are cut off and trapped, smaller and smaller poolsof water.The deadly Sahara has claimed its first victims.
In the quest to discover the history of thevast Sahara Desert, geologists have so far uncovered two important clues: Sea fossilsin the Great Pyramids of Egypt show these building blocks were once underwater. Whale bones reveal that the sea submerged much of the Sahara 37 million years ago. Asthe forces of plate tectonics pushed the Sahara out from under the sea, it created a tropical swamp. In order tofigure out what made it into the wasteland visible today, scientists have topinpoint the moment of its birth. But the clues to this mystery turned out tobe hidden in the last place anyone expected.
20 million years ago, the Sahara Desert was alush tropical swamp; geologists are now piecing together the story of the next20 million years. Today the Sahara lies in what is known as the desert belt, a region of dry air northof the equator. Here strong winds clear the sky of clouds and dry out the landbelow. It stretches through the Gobi Desert in China andacross the deserts of the Southwestern United States. The Sahara is the largest and yetgeologists know next to nothing about when it was created.
What we have are just these little bits andpieces, these snap shots of what the Sahara was like. Because the windblows away a lot of our record and what isn't blown is often covered by sand,so it's kinda hard to find the rocks we need to tell the story we are trying totell.



This post was generated by put listening repetition system,  Check the original dictation thread!
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本帖最后由 sylvia_qian 于 2010-2-7 17:21 编辑

The answer lies not in climate patters but in geology. The entire African continent is underpinned by a giant piece of the earth crust. It’s called a tectonic plate, and 40 million years ago in what is known as the Eocene Age, it was on the move.

-So, at / Wadi Al-Hitan we have whale swimming around in this Eocene Ocean, all the while the African plate is moving to the north.

Africa, collies with Europe, closing the Tethys Sea, but the African plate keeps moving.

-So we uplifted / the northern part of Africa, and so the Tethys Sea recedes and we’ve got this whole area of North Africa now / emerge, it’s out on land.

The whales of Wadi Al-Hitan are cut off and trapped, smaller and smaller pools of water. The deadly Sahara has claimed its first victims.

In the quest to discover the history of the vast Sahara Desert, geologists have so far uncovered two important clues: sea fossils in the Great Pyramids of Egypt show these building blocks were once under water; whale bones reveal that a sea submerged much of the Sahara 37 million years ago. As the forces of plate tectonics

push the Sahara out from under the sea, it created a tropical swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth, but the clues to this mystery turn out to be hidden in the last place anyone expected.


20 million years ago, the Sahara Desert was a lush tropical swamp. Geologists are now piecing together / the story of the next 20 million years. Today, the Sahara lies in what is known as the desert belt, a region of dry air north of the equator. Here, strong winds clear the sky of clouds and dry out the land below. It stretches through the Gobi Desert in China and across the deserts of the southwestern United States. The Sahara is the largest and yet geologists know next to nothing about when it was created.

-What we have are just these little bits and pieces these snapshots of what the Sahara was like because the wind blows away a lot of our record and what isn’t blown away is often covered by sand, so it’s kinda hard to find the rocks we need to tell the story we are trying to tell.
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[Homework]2010-02-07 地球的起源 EarthMade—4

homework: the answer lie not in climate patterns, but in geology.In entire Afican continent is underpinned by a giant earth crust.It is called a tectonic plate. And fourteen million years ago in what is known in Esage, it was on the move. so everyone is on the tent.we have whale swimming around this Esocean ocean. All the while the Afican plate is plan moving into the north. Afican collide with the Europe.closing the Tethys sea.but Afican plate keeps moving. so we uplifed the northern part of Afican. And the Tethys recede. we got whole area of northern Afican now in merge out on land.the whale is what ouhetown.are cut off a trap smaller and smaller pulls the water.the deadly Saharah has claim its first victims.in the quest to discover the history the vast dessert,geologists have so far uncover two improtant clues.sea fossil in a great pyramid in Egypt show the building block once under water.Whale bone reveal the sea submerge much Saharah thirty seven million years ago.As the force of plate tectonics push the Saharah out from the sea, it creat a tropical swamp.It order to figure out what made it into wasteland visible today, scientist have to pinpoint the moment of the birth, but the clues to this mystery turn out hidden in the last place any want expect it.twenty million year ago the Saharah dessert was the large tropical swarmp. Geologist now piece together the story of the next twenty million year .Today the Saharah lie what it know as a dessert belt, a region dry air  north of the equator. her strong wind clear the sky of clouds and  dry out the land below.it stretches through Gobi dessert in China and across the Southwest of United States.The Saharah is no largest.yet Geologist know next to nothing about when it is created. what we have is little bits the pieces,the snapshot of what Saharah was like, because the wind blow away a lot out of the record, what it is blow wind is often cover by sands. so it can hard to find the rock we need to tell the story we try to tell.

This post was generated by put listening repetition system,  Check the original dictation thread!

[Homework]2010-02-07 地球的起源 EarthMade—4

The answer lies not in climate patterns,but in geology.The entire African continent is under pain by a gaint piece of earth crust.It's called a techtonic plate.And 40 million years ago, it was what known as ice age,it was on the move.
So everywhere in tan, we have well soon around this Eocene notion.All the well the Africa plate is moving to the north.Africa collaps whith Europe.Close the Thepy sea,but the Africa plate keeps moving. So we uplifted the north part of Africa, as in the Thepy sea receives, and we got this whole era of Northern Africa emerge is out on land.
The whale of Wadi Ahi town are color of trap smaller and smaller to the water.
The Dedlis Helle has claimed his first victims,in the question discoverd the history the vast Herry Desert,geologists has so far uncovered two important clues:sea fossils in the great Pyramid of Egypy show these building blocks were once under water.
Whale bone reveals the sea submerge much of the Sahara 37 million years ago.As the forces of plate techtonic push the Sahara of under the sea in created a tropical swant.In order to fingure out what made into the waste land visiable today, sicentists have to pain point the moment of its birth.But the clue, to this mistreat turn out to be hidden in the last place, anyone expected.20 million years ago, the Sahara desert was rush tropicl swap,geologists now are piecing together the story of the next 20 millon years.Today the sahara lies in what is known as the desrt  belt,a region with dry airs north of the equator.Here strong wind clear the sky of clouds and dry the land below.Its stress the Gobi desert in China and Crosst desert of the Southwest in United States.The Sahara is the largest and yet geologists knows next to nothing when it was created.
Habe just the little bits piece the snape shots of what Sahara was like because the wind belows away of our record in what is belowing away is ofen covered by sand, so it's can hard to find rocks we need to tell the story which trying to tell.

This post was generated by put listening repetition system,  Check the original dictation thread!
homework

The answer lies not in climate patterms, but in geology. The entire African continent is underpined by a dr- piece of earth crossed. It's called a tectonic plate. 40 million years ago, in what is known as the E- Age, it was on the move.

"So out of the Auhitan, we have whales swimming around this E- Ocean, all the while the Africa plate is moving to the north."

Africa collides with Europe, closes the Tethys Sea. But the Africa plate keeps moving.

"So we uplifted Northern part of Africa, as the Tethys Sea recedes. And we got this whole area of North Africa now emerge, it's out on land."

The whales of Wa- Auhitan are cut off and trapped, smaller and smaller pools of water. The deadly Sahara has exclaimed its first victims.

In the quest discovered the history of vast Sahara Desert, geologists have so far uncovered two important clues: sea fossiles and the Great Pyramids of Egypt show these building blocks were once under water; Whale bones reveal that the sea submerged much of the Sahara 37 million years ago.

As the forces of plate tectonics pushed the Sahara out from under the sea, it created a tropical swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place anyone expected.

20 million years ago, the Sahara Desert was a lush tropical swamp. Geologists are now piecing the story of next 20 million years. Today, Sahara lies in what is known as the Desert Belt, a region of dry air north of the equator. Here strong winds clear the sky of clouds and dry out the land below. It stretchs through the Gobi Desert in China, and acrosses the deserts of Southwestern United States.

The Sahara is the largest, and yet geologists know next to nothing about when it was created.

"What we have are just these little bits and pieces of these snap shots of what the Sahara was like, because the wind blow away a lot of our records and what isn't blown away is often covered by sand. So it's kind of hard to find the rots we need to tell the story we are trying to tell."
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The answer lies not in climate patterns, but in geology. The entire African Continent is underpinned by a giant piece of the earth crust. It’s called a ___ plate. And 40 million years ago, in what is known as the ___ age, in was on the move.

“So, everybody here attended, we have whales surrounding the ___ notion. All the wild of the African plate is moving to the north.”

Africa collides with Europe, closing the Tethys Sea. But the African plate keeps moving.

“So, we uplifted the northern part of the Africa, and so, the Tethys Sea ___. And we’ve got this whole area of north Africa now emerged. It’s out on land.”

The whales of ___ ___ are cut off and trapped in smaller and smaller, pools of water. The deadly Sahara claimed its first victims.

In the quest to discover the history of the vast Sahara Desert, Geologists so far uncovered two important clues. Sea fossils, in the great period of Egypt show these building blocks were once under water. Whale bones, revealed that sea submerged much of the Sahara, 37 million years ago.

At the ___ ___, push the Sahara out from under the sea. It created a ___ ___.

In order to figure out what made it into the waste land visible today, scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place, anyone would expect. ??

20 million years ago, the Sahara Desert was a large ___. Geologists are now piecing together the story of the next 20 million years.

Today, Sahara lies in what is known as the desert built, origin of dry air north of the ___. Here, strong winds clear the sky of clouds and dry out the land below. It stretches through the Gobi Desert in China, and across the deserts of the southwest US. The Sahara is the largest and yet geologists know next to nothing about when it was created.

“What we have are just a little bit of pieces of ___ of what the Sahara was like. Because the wind blowed away all of the records and wasn’t blowing away is often covered by sun. So, it is a kind of hard to find the rocks we need to tell the story we are trying to tell.”

[Homework]【整理】2010-02-07 地球的起源 EarthMade—4

The answer lies not in climate patterns but in geology. The entire African continent is underpinning(underpinned)by a giant piece of earth crust. It is called a tectonic plate. And 40 millions years ago, in what is known as the Eocene age, it was on the move. So (at Wadi Al Hitan)we have whales swimming around in this Eocene Ocean, all the while the African plate is moving to the north.  Africa, collides with Europe, closing the Tethys Sea. But the African plate keeps moving. So we uplifted the northern part of Africa, the Tethys Sea recedes, and we've got the whole area of North Africa now emerge it is out on land. The whales of Wadi Al Hitan are cut off and trapped, smaller and smaller poles (pools) of water.  The deadly Sahara has claimed its first victims. In the quest to discover the history of vast Sahara desert, geologists have so far uncovered two important clues. Sea fossils in the Great Pyramids of Egypt show these building blocks were once underwater, whale bones revealed that a sea submerged much of the Sahara 37 millions years ago. As the forces of plate tectonic push Sahara out from under the sea, it created a tropic swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place anyone expected.  20 millions years ago, the Sahara desert was a larch (lush) tropic swamp. Geologists are now piecing to get (together) the story of the next 20 million years. Today the Sahara lies in what is known as the desert built (belt)--a region of dry air north of the equator. Here strong winds clear the sky of clouds and dry out the land below. Instructors (It stretches) through the Gobi desert in China and across the deserts of the South Western United States. The Sahara is the largest. And yet geologists know next to nothing about when it was created. What we have are just some (these) little bits and pieces these snap  (snapshots) of what the Sahara was like, because the wind blowed away a lot of our record and what is not blowing is covered by sand, so it is hard to find the rocks we need to tell the story we are trying to tell.

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The answer lies not in climate patterns but in geology. The entire African continent is underpinning(underpinned)by a giant piece of earth crust. It is called a tectonic plate. And 40 millions years ago, in what is known as the Eocene age, it was on the move. "So (at Wadi Al Hitan)we have whales swimming around in this Eocene Ocean, all the while the African plate is moving to the north."  Africa, collides with Europe, closing the Tethys Sea. But the African plate keeps moving." So we uplifted the northern part of Africa, the Tethys Sea recedes, and we've got the whole area of North Africa now emerge it is out on land." The whales of Wadi Al Hitan are cut off and trapped, smaller and smaller poles (pools) of water.  The deadly Sahara has claimed its first victims. In the quest to discover the history of vast Sahara desert, geologists have so far uncovered two important clues. Sea fossils in the Great Pyramids of Egypt show these building blocks were once underwater, whale bones revealed that a sea submerged much of the Sahara 37 millions years ago. As the forces of plate tectonic push Sahara out from under the sea, it created a tropic swamp. In order to figure out what made it into the wasteland visible today, scientists have to pinpoint the moment of its birth. But the clues to this mystery turned out to be hidden in the last place anyone expected.  20 millions years ago, the Sahara desert was a larch (lush) tropic swamp. Geologists are now piecing to get (together) the story of the next 20 million years. Today the Sahara lies in what is known as the desert built (belt)--a region of dry air north of the equator. Here strong winds clear the sky of clouds and dry out the land below. Instructors (It stretches) through the Gobi desert in China and across the deserts of the South Western United States. The Sahara is the largest. And yet geologists know next to nothing about when it was created. "What we have are just some (these) little bits and pieces these snap  (snapshots) of what the Sahara was like, because the wind blowed away a lot of our record and what is not blowing is covered by sand, so it is hard to find the rocks we need to tell the story we are trying to tell."
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