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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(64) / 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)

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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

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农业与发展

<词海拾贝>Don't Cut OYff your NTose To Spite Your Face

Don't cut off your nose to spite your face是一项警告：不要因为愤怒冲动行事，用伤害自己的方式来复仇。打个比方说，如果你因为太痛恨电视节目里的某个政客而

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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

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Maritime specialists say a surge in pirate attacks on ships between Somalia and Yemen is affecting global commerce and they are urging the international community to quickly find a solution to the crisis. As VOA Correspondent Alisha Ryu reports from

发表于:2019-02-03 / 阅读(47) / 评论(0)

VOA标准英语2008年（九月）

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