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AS IT IS 2014-05-02 Young People Crowd Science and Technology Fair 在科技展上聚满了年轻人 Hello to one and all, and welcome back to the program that will help you learn and improve your American English. Im Jim Tedder in Washington. If you
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By Cathy Majtenyi Nairobi 19 May 2008 Fuel efficient stoves and ceramic water purifiers are two examples of low-tech innovations that can help people in poor countries improve their quality of life. Because what is known as appropriate technology usu
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