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) 分类 Scientific American(六)月

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(87) / 评论(0) 分类 农业与发展

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) 分类 经济学人科技系列

Former world No.1 Ivanovic upset at China Open BEIJING, Oct. 3 (Xinhua) -- Serb Ana Ivanovic's 4th consecutive run to the quarterfinals at the China Open was snipped here on Wednesday as the former world No.1 lost to Romina Oprandi of Switzerland in

发表于:2019-02-05 / 阅读(52) / 评论(0) 分类 英语新闻

NEW YORK, Sept. 5 (Xinhua) -- US powerful Serena Williams served nine aces to dispatch former world No. 1 Ana Ivanovic in straight sets among gusty wind, advancing into the quarterfinal of US Open on Monday. Williams, a 13-time major champion and thr

发表于:2019-02-05 / 阅读(55) / 评论(0) 分类 英语新闻

BEIJING, Oct. 6 (Xinhua) -- Former world number one Ana Ivanovic of Serbia will return to Bali in November to defend her Commonwealth Bank Tournament of Champions title after receiving the first wild card for the event on Thursday. Last year Ivanovic

发表于:2019-02-05 / 阅读(50) / 评论(0) 分类 英语新闻