SSS 2009-04-28

This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left. Now scientists at the Nation

发表于:2018-12-24 / 阅读(44) / 评论(0)

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banister, ['bnistə] n （楼梯的）栏杆＝balustrade＝rail 【记】ban挡住，ister东西－挡住的东西－栏杆【类】staircase:banister＝garden:fence楼梯需要栏杆保护＝花园需要栅栏保护

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不择手段背单词

20 Years after Tragedy in India, New Report Accuses US Compa

In the early morning hours of December 3, 1984, deadly gas leaked from a Union Carbide pesticide factory in Bhopal, India. The accident would result in the worst industrial disaster of the 20th centur

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VOA2004（下）--世界经济

VOA慢速英语2018--US Timekeeping Stations Might Go Silent

Three radio stations in the United States mainly broadcast one thing: the official time. The three are radio stations WWV and WWVB, in the state of Colorado, and WWVH, on the island of Kauai in Hawaii. They send out signals that are used by millions

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Next year will mark the 110th anniversary of a U.S. government agency that is unknown to most Americans. Yet its work affects their everyday lives in countless ways. Generations knew the agency as the National Bureau of Standards. When it was founded

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英文摇滚歌曲：Delain - Tell Me Mechanist

Tell me, Mechanist, is it true? Does none of it bother you? Once upon a time Upon a time behind us The mechanist inclined Clockworks of time define us Who you are, who you are; Merely springs that tick The time of things away The cry from the beast i

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