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This is Scientific American's 60-Second Science. I'm John Matson. Got a minute? In a laboratory vault outside Paris is a small cylinder of platinumiridium alloy that serves as the standard for all mass measurements worldwide. By an 1889 international
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379 、 石棉 asbestos;asbestus 380 、 石膏 PlasterofParis 381 、 示波器 oscilloscope 382 、 立体图 pictorialdrawing 383 、 交流电流 alternatingcurrent(a.c.) 384 、 交流电压 a.c.
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NASA Scientists Testing New Aircraft Designs NASA的科学家测试新飞机的设计 The U.S Aeronautics and Space Administration, NASA, is commonly associated with space exploration, but aeronautics is still a big part of the agencys research. Engi
VOA标准英语2014年(四月)
NASA科学家试验设计新型飞机 The U.S Aeronautics and Space Administration, NASA, is commonly associated with space exploration, but aeronautics is still a big part of the agencys research. Engineers at its Aeronautics Research Center, in Ham
VOA双语新闻 2014年4月
美国航空航天局科学家测试新型飞机 The U.S Aeronautics and Space Administration, NASA, is commonly associated with space exploration, but aeronautics is still a big part of the agencys research. Engineers at its Aeronautics Research Cen
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Nitinol Nitinol is one of the most extraordinary metals to be discovered this century: A simple alloy of nickel and titanium, nitinol has some perplexing properties. A metal with a memory, it can be made to remember any shape into which it is fashion
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