单词:rotary concentrator
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SCIENCE IN THE NEWS - Fight to End Polio a Story of Unexpected Problems, but Also Progress Over the years, polio experts have had to learn to deal with surprises. Transcript of radio broadcast: 03 March 2008 VOICE ONE: This is SCIENCE IN THE NEWS in
This is the VOA Special English Development Report. Sometimes it takes an engineer to help a village. In poor communities, that help may come from volunteers with a group called Engineers Without Borders. A civil engineering professor in the United
It Can't Happen Here by Sinclair Lewis Chapter 10 While I hate befogging my pages with scientific technicalities and even neologies, I feel constrained to say here that the most elementary perusal of the Economy of Abundance would convince any intell
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Christmas in America means different things to different people. To some people, Christmas means brightly wrapped packages under a decorated tree. To others, it means family reunions and a wonderful meal together. To Christians, it means Jesus' birth
Now look, I'm a technology fan, but I have to admit to you all I'm a little old. 我是一个技术发烧友,但我得承认我年纪是大了点。 So I was a little slow, and I did not trust technology, and when they first came out with those new