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发表于:2018-12-16 / 阅读(277) / 评论(0)

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This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. Saliva contains many useful components: lubricants, enzymes for breaking down food and now compounds that can reveal a persons age. Thats according to a

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Ever get a sour stomach after your morning coffee? Well, you might end up switching to a dark roastbecause that coffee concoction may leave you with a happier tummy. That's according to the research presented at the American Chemical Society meeting

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发表于:2018-12-28 / 阅读(289) / 评论(0)

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发表于:2019-01-02 / 阅读(310) / 评论(0)

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Study: Loss of Ozone Slows

By Caty Weaver Broadcast: September 12, 2003 This is Bob Doughty with the VOA Special English Environment Report. Scientists in the United States have reported some good news about the 1)ozone in the

发表于:2019-01-11 / 阅读(334) / 评论(0)

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abiologic

adding-up

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ambiguo-accessorius paralysis