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发表于:2018-11-28 / 阅读(434) / 评论(0)

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[00:03.38]1998 [00:06.71]They were, by far, [00:07.93]the largest and most distant objects [00:10.14]that scientists had ever detected: [00:12.36]a strip of enormous cosmic clouds [00:14.67]some 15 billion light-years from earth. [00:17.40](1)But ev

发表于:2018-11-30 / 阅读(396) / 评论(0)

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By Mario Ritter Broadcast: July 29, 2003 (THEME) VOICE ONE: I'm Bob Doughty with Phoebe Zimmermann, and this is the VOA Special English program, SCIENCE IN THE NEWS. VOICE TWO: This week -- a special

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发表于:2018-12-08 / 阅读(479) / 评论(0)

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发表于:2018-12-10 / 阅读(502) / 评论(0)

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发表于:2019-01-03 / 阅读(275) / 评论(0)

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发表于:2019-01-12 / 阅读(297) / 评论(0)

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发表于:2019-01-12 / 阅读(349) / 评论(0)

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发表于:2019-01-18 / 阅读(256) / 评论(0)

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发表于:2019-02-07 / 阅读(456) / 评论(0)

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发表于:2019-02-12 / 阅读(264) / 评论(0)

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