[建] 次甲基

SSS 2011-06-22

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)

Scientific American(六)月

SSS 2010-03-23

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

发表于:2018-12-24 / 阅读(66) / 评论(0)

Scientific American(三)月

Take Away English-Bank Holiday DIY 公假日自己动手做

Ready to paint some walls? Whenever theres a Bank Holiday weekend in Britain, a certain kind of shop always gets very busy, and its not what you might think clothes shops or music shops. The British flock to DIY stores and garden centres and huge nu

发表于:2019-01-02 / 阅读(51) / 评论(0)

Take Away English

AGRICULTURE REPORT - Restrictions on Methyl Bromide

AGRICULTURE REPORT - Restrictions on Methyl Bromide By Mario Ritter Broadcast: Tuesday, March 16, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Graphic Image Some chemicals

发表于:2019-01-06 / 阅读(83) / 评论(0)

农业与发展

经济学人69:外因遗传与压力新生儿蓝调曲

Science and Technology Epigenetics and stress Baby blues 科技外因遗传与压力新生儿蓝调曲 A mother's stress while she is pregnant can have a long-lasting effect on her children's genes 母亲孕期压力过大会对孩子的基因造成长

发表于:2019-01-26 / 阅读(58) / 评论(0)

经济学人科技系列

Why British men are a nation of DIY dunces

Why British men are a nation of DIY dunces Millions of men have no idea how to do simple DIY tasks, a survey suggests Feeling guilty about all those DIY jobs you haven't quite got round to? Well, if it is any comfort, you are not alone. Millions of m

发表于:2019-02-18 / 阅读(49) / 评论(0)

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A-CAH

abscess of epiglottis