音标:[,tetrә'meθili:n] ;
n. [化]四亚甲基
n. A hypothetical hydrocarbon, C4H8, analogous to
trimethylene, and regarded as the base of well-known series or
derivatives.
n. Sometimes, an isomeric radical used to designate
certain compounds which are really related to butylene.

This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang

发表于:2018-12-24 / 阅读(214) / 评论(0) 分类 Scientific American(一)月

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DAVID GREENE, HOST: Families across the United States are fighting with the federal government over a deadly chemical. Dozens of people have died from inhaling methylene chloride. This is an ingredient in common paint removers. NPR's Rebecca Hersher

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10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur

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