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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

发表于:2018-12-24 / 阅读(63) / 评论(0)

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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:2019-02-04 / 阅读(38) / 评论(0)

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学英语单词

ablennes hians

adjust supply and demand for funds

alkanoates

Amcill-S

argue against someone on something

argy

avibirnavirus infectious bursal disease virus of fowl