单词:chalcocyanite
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PEOPLE IN AMERICA - Mary Lyon By Vivian Bournaian Broadcast: Sunday, January 25, 2004 (THEME) ANNCR: Welcome to People in America in VOA Special English. Every week at this time, we tell the story of
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. As long as there have been mice, people have sought a better mousetrap. And since we figured out that bacteria can make us sick, weve searched for better
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1. It's cool. cool 是青少年(teen-agers) 常用的字,(有时也用 debonaire) 其真正意思是指可以接受的好事;或是情况可以控制;或是保持冷静、文雅、礼貌、外表不错,能够合乎年轻人的标准。(可指