只用一本书提高英语听力能力!重温经典名著双语阅读小编推荐:跟着纪录片学英语不背单词和语法,轻松学英语
返回列表 回复 发帖

[report整理] SENEWS-2011-04-25

提高英语听力能力 找对方法很重要!

[Homework]SENEWS-2011-04-25

This is the VOA special English technology report.
Soler water heaters are used around the world,and are not very difficult to build.The system we are ?to describe is based on a design developed some years ago in Afganastan.Since then,it has been built and used in many countries,it can heat seventy littles of water to sixty degrees celsius.It can do this between sunrise and noom on a clear day with an average air temperature of thirty two degrees celsius.
There are two parts to the soler water heater,one part is made of a sheet of metal to black,black surfaces become hotter in the sun then surfaces painted any other color,this black metal plat is called a collecty,the collector is placed in contact with the water,there are several kinds of metal sheets that can be used for the collector,corrugated metal will work very well,corrugated sheets are often used as roofs on housing.once the water is heated,it's capped hot with insolation meterial,this allows the water to stay warm for a long time.
The second part of the soler water heater holds the water for the system,this storage tank can be a container that holds about ane hundred littles.Two rubber pipes are attach to the water storage tank.One pipe lets water flow into the system,the other lets water flow out.When the water heater is working correctly,water will flow from the storage tank to the collector and back again.You can use the hot water at the top of the tank for washing and cleaning,you can change the flow of water so that the temperature is hot or warm as designed.This soler water heater is easy to build and operate,it will last about two years before the rubber pipe need to be replaced.There is also something else you will need to make the soler water heater work,the sun,as you might imagine the heater will heat water only on sunny days,you can get more information about soler water heaters and other project from enter prides works wittle.This group works internationally to fight poverty,the website is enterpridesworks.org,choose the link for a news and resouces when click on publication.
And that's the VOA special English technology report.Tell us if you have ever built the soler water heater or have ideas for improvements,post your comments at VOAspecialEnglish.com,you can also find transcripts,mp3 and part cast of our programs,we also offer English teaching activities in the classroom section of our site,I'm Steve Ember.

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