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Broadcast: May 5, 2003 By Jill Moss This is the VOA Special English Development Report. Each year more than two-million people die from diseases caused by drinking dirty water. That is the estimate of
By Carolyn Weaver New York 09 August 2007 Design is a topic most often associated with luxury goods. But an exhibit at the Cooper-Hewitt National Design Museum in New York focuses on innovative ways to address the needs of the world's poor. The objec
金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源
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