胚外中层；胚外中胚层, 胚外中层

Biggest Stories in 2002 (1)

Health nbsp; Economics The big story for Washington for 2002 is going to be the November elections. And while that’s a long way off for the rest of the country, it’s very much on politicians- mind

发表于:2018-11-28 / 阅读(109) / 评论(0)

疯狂英语2002年

NPR 2011-06-06

Agricultural officials say they think an organic farm in northern Germany was the source of the deadly E. coli outbreak that has sickened more than 2,000 people in Europe. Twenty-two people have died. Investigators traced the bacteria to beansprouts

发表于:2018-12-17 / 阅读(59) / 评论(0)

2011年NPR美国国家公共电台6月

HEALTH REPORT - New Embryonic Stem Cell Lines Developed for

HEALTH REPORT - New Embryonic Stem Cell Lines Developed for Researchers By Paul Thompson Broadcast: Wednesday, August 11, 2004 This is Gwen Outen with the VOA Special English Health Report. Researcher

发表于:2019-01-08 / 阅读(53) / 评论(0)

健康与经济

VOA慢速英语 2008 1112a

This is the VOA Special English Health Report. Bethesda, Maryland, near Washington, D.C., is home to the National Institutes of Health. N.I.H. calls itself the Nation's Medical Research Agency. But it supports research worldwide with its budget of a

发表于:2019-01-11 / 阅读(52) / 评论(0)

VOA慢速英语2008年（十一）月

2007年VOA标准英语-Embryonic Research Poses Dilemma for Religious

By Ted Landphair Washington 26 July 2007 For a second time in a year, President Bush has vetoed a bill that would have sanctioned federally funded stem cell research using human embryos. His stance reflects conservatives' view that destroying life to

发表于:2019-01-12 / 阅读(93) / 评论(0)

2007年VOA标准英语（七月）

哺乳动物已实现逆生长十年内将进行人体试验

An end to grey hair and crows-feet could be just 10 years away after scientists showed 科学家发现，动物的衰老过程有可能逆转。 it is possible to reverse ageing in animals. 从此以后，可能仅需10年，人类就可以告别白发

发表于:2019-02-01 / 阅读(40) / 评论(0)

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aggregate production function