单词:normal element time
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北京奥运28大项 参与,竞争,分享,进步 Equestrian 马术 Jumping 障碍赛 英文原文 A jumping competition is one in which the combination of horse and competitor is tested under various conditions over a course of obstacles. It is a test intended to demon
Science and Technolgy. 科技。 Modern alchemy. 现代炼金术。 Turning a line. 进入新的一行。 The race to extend the periodic table continues. 扩展元素周期表的比赛仍在继续。 ONE of the first inklings that chemistry has an u
by Jason Marshall In the last article, we began talking about mathematical sequencesin particular, a type of sequence known as an arithmetic sequence. Today, were going to turn our attention to another type of sequence called a geometric sequence. In
But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inch
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
Anchor: British Prime Minister David Cameron is painting an optimistic future for the country, calling on the people of the UK to show their resolve in a time of challenge. As CRI's UK correspondent Tu Yun reports, Cameron's comment comes following w