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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
Scientific American(四)月
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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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
2018年VOA慢速英语(九)月
Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol
Scientific American(八)月
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
VOA标准英语2010年(十一)月
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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