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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) 分类 Scientific American(六)月

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) 分类 Scientific American(三)月

8Benjamin was the father of Bela his firstborn, Ashbel the second son, Aharah the third, 2Nohah the fourth and Rapha the fifth. 3The sons of Bela were: Addar, Gera, Abihud, 4Abishua, Naaman, Ahoah, 5Gera, Shephuphan and Huram. 6These were the descen

发表于:2018-12-31 / 阅读(149) / 评论(0) 分类 历代志

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(88) / 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

Adrienne: So, Mary, my battery has almost ran out. I'm so glad you had some but they're cold. Mary: Well, I keep them in my frigerator along with several other sizes of batteries just so I have them on hand. It's a little quirky habit of mine but I a

发表于:2019-02-17 / 阅读(45) / 评论(0) 分类 英语访谈对话