单词：chemistry of comets
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. Thisll just take a minute. Any school kid can tell you that comets are made of ice. That frozen water burning off is what gives comets their characteristic tails. But asteroids were g
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[00:00.00]Lesson 14 Comets [00:02.60]彗星 [00:05.20]In recent scientific investigation of comets has increased [00:14.16]because of a growing interest in the origin of the sun and planets. [00:17.63]近年来，由于对太阳和行星的起源兴趣
赖世雄学英语第四册
This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? The Apollo moon missions ended almost 40 years ago. But for lunar scientists, they're gifts that keep on giving. Researchers studying rocks brought back by ast
Scientific American(一)月
Comet 彗星 Do you know what a comet is? 你知道彗星是什么吗？ A comet is an object in the solar system. 彗星是太阳系中的天体。 It travels around the sun like the planets. 它像其它行星一样绕着太阳转。 Then, why don'
与美国小学生一起学英文第11册
[6] One group, led by John Matese, professor of physics at the University of Louisiana at Lafayette, confirms the notion that it is most likely to be a brown dwarf, a star that never accumulated enoug
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By Tom Rivers London 07 October 2009 Ada Yonath (file photo) Two Americans and one Israeli share this year's Nobel Prize in Chemistry for their work showing how the DNA code is translated into life itself. Americans Venkatraman Ramakrishnan and Thom
VOA标准英语2009年(十月)