单词：eka-ytterbium
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单词：eka-ytterbium 相关文章
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
发表于:2019-01-08 / 阅读(169) / 评论(0)
Scientific American(八)月
Scientific American(八)月
By Saqib ul-Islam Washington 12 October 2009 Amreeka's stars, pictured on the movie's promotional poster What is it like for a mother and her teenage son to settle in America? And what if they are Palestinian and their arrival coincides with the ons
发表于:2019-02-20 / 阅读(233) / 评论(0)
VOA标准英语2009年(十月)
VOA标准英语2009年(十月)