单词:Tetraseptan
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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
T Tanshinone IIA 丹参酮IIA Tanshinone I 丹参酮I Tanshinone IIB 丹参酮IIB Taraxasterol 蒲公英甾醇 Taraxerol 蒲公英赛醇 Tauro ursodesoxy cholic acid 牛磺熊去氧胆酸 Taxifolin 花旗
By Cynthia Kirk Broadcast: September 6, 2003 This is Steve Ember with the VOA Special English program, In the News. Thursday will mark two years since the attacks on the United States. On September el
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On Sept. 11, He Checked Hijackers Onto Flight 77. It's Haunted Him Ever Since play pause stop mute unmute max volume 00:0003:23repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or upda
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