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Todd: So hey Josh, how you doing? Josh: Im good. How are you? Todd: Oh, doing pretty good. Josh, how old are you? Josh: I am 17. Todd: 17, so you're kind of at the start of your life. Josh: Yeah, I guess you could say that. Todd: Thats pretty awesome
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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?. [Spray sound.] Killing bugs? No. [Spray sound.] Deodorizing the bathroom? No. [Spray sound.] Checking for explosives, yes. Because chemists at the University of Califor
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英语学习笔记： graduation n. 毕业；毕业典礼 farewell int.再会；别了 ceremony n. 仪式；礼节；典礼 academic adj.学院的；学术的 gown n. 长袍；长外衣 tassel n. 流苏 recruitment n.征募新兵；补充；招聘 bi
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