生活大爆炸第二季第二十集二_3

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SSS 2011-05-23

This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Whether it's for streaming Netflix or sharing files, we're gobbling up more and more dataand we want it faster. But even shooting data with lasers over fiber-o

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Multimode Optical Fiber(S) Multimode fibers, with much wider cores than single mode fibers, allow light to enter at various angles, and reflect (bounce off of) core-clad boundaries as electromagnetic

CNN 2012-02-13

Ambassador Rice ,the second youngest person to hold that position.She's the first African American woman to be America's representative to the United Nations so she did perfect in the theme of this year's Black history month,black woman in the Americ

NPR 2009-08-01

The government reports the nation's Gross Domestic Product fell one percent in the first quarter, a far slower contraction than the previous quarter when GDP shrank 6.4%. President Obama called it progress resulting from his administration's actions

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TED演讲:世上最难翻译的词之一

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双语有声阅读:UK and China boost learning links 中英将加

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VOA慢速英语20060815b

SCIENCE IN THE NEWS - Rethinking the Personal Computer in a World That Centers on the InternetBy Caty Weaver and produced by Mario Ritter Broadcast: Tuesday, August 15, 2006 VOICE ONE: This is SCIENCE

微电子辞典-1

Abrupt junction 突变结 Accelerated testing 加速实验 Acceptor 受主 Acceptor atom 受主原子 Accumulation 积累、堆积 Accumulating contact 积累接触 Accumulation region 积累区 Accum

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