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This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro

发表于:2018-12-24 / 阅读(72) / 评论(0)

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Jennifer: Hi and welcome to 6 Minute English from BBC Learning English. I'm Jennifer, and with me in the studio today is Neil! Hi Neil! Neil: Hi there Jennifer. Jennifer: Today's story is all about people who collect money for charity. Neil: Yes, in

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发表于:2019-01-10 / 阅读(45) / 评论(0)

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发表于:2019-01-23 / 阅读(34) / 评论(0)

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affinity analysis

air charging machine

american geophysical union (agu)

amplification-factor

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below edge reading of meniscus