音标：['priːbaɪəʊ'lɒdʒɪkəl] ；

adj. 生命起源以前的

字源大挪移 Prefix - 表示方位的字首 08 pre

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发表于:2018-12-04 / 阅读(112) / 评论(0)

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IN THE NEWS - John Kerry Chooses John Edwards for Vice Presi

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发表于:2018-12-10 / 阅读(190) / 评论(0)

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发表于:2018-12-16 / 阅读(75) / 评论(0)

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发表于:2018-12-18 / 阅读(150) / 评论(0)

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发表于:2018-12-19 / 阅读(179) / 评论(0)

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SSS 2008-11-28

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. If you paid attention during high school biology, you probably remember that girls are born with all the eggs theyll ever have, whereas guys are churning

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发表于:2018-12-30 / 阅读(254) / 评论(0)

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The 2009 Nobel Prize in Chemistry goes to Venkatraman Ramakrishnan of the MRC Laboratory of Molecular Biology in England, Yale Universitys Thomas Steitz, and Ada Yonath of the Weizmann Institute of Science in Israel for their studies of the ribosome.

发表于:2019-01-08 / 阅读(101) / 评论(0)

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This is Scientific American's 60-Second Science.I'm Steve Mirsky. Got a minute? Hi. Im running. Im also telling some ofmy stem cells what to do right now. Well, I probably am, based on a new study with mice. We have what are called mesenchymal stemce

发表于:2019-01-08 / 阅读(126) / 评论(0)

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