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[探索发现] 【整理】2010-02-19 地球的起源 EarthMade—9

提高英语听力能力 找对方法很重要!
Nick Drake gets words in 2009, archeologists made an important discovery
that supports the river theory, stone tools found not far from the site of mega
lake in Tunisia, the first step is to identify the shoreline of the ancient lake

"aah, and this, this is good, so we get some fresh water mollusks."

these tiny shells are good signs of the lake, now he searchs for what may
have been drinking the water when the mega lake existed

"we have a, what looks like a, part of a jawbone, of a small herbivore, you
see three teeth running along there, something of egzille"

so animal must have existed here in the desert when it was green,

"ok, so we've got a, a stone tool here"

"it's become blunted and re-touched with a lot of free fine flakes of edge,
a fact that we got stone tools and we got dead animals, suggest hunting,
and this was animal being hunted, and then we got water, so people sitting
around the hole, when the animal come to drink, and then killing them, eating
them, leaving them behind"

it's important find, a stone age tool shows people lived on the shore of this
ancient lake, and 90 thousands years ago was a turning point, not just the
story of sahara, but in the history of humanity itself.

we are all descended from one group of people in eastern africa, the birth
place of human kind, some time between 80 and 120 thousand years ago, modern
people started the long journey out of africa, no one knows for certain
what route they took, the prevailing view is the sahara was impossible so
humans left east africa and traveled to the coast, then across a land-bridge
into arabian Peninsula, but Srake suspected if the mega lake was fed by a
river system, it would have created a green corridor across the burning sand,

so our ancestors could follow this river systems, gone around the lakes, follow
the next river systems, around the next lake, and the next river system,
around the last lake, then they'll be in north africa, and it'll be simple
for them just to move out,

a lake is a good story, and the river pluse the lake is a very concrete story.

to find the proof of his theory, Drake headed to one of few areas in the desert,
where water still flows-anowasis.
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