胚性群体

THIS IS AMERICA - The Lost Colony

THIS IS AMERICA -March 4, 2002: The Lost Colony By Jill Moss . . . . . . . Broadcast: March 4, 2002 VOICE ONE: In Fifteen-Eighty -Seven, more than one-hundred men, women and children sailed from Brita

发表于:2019-01-02 / 阅读(110) / 评论(0)

This is America

VOA慢速英语-THIS IS AMERICA - America's 'Lost Colony': A Story W

Welcome to THIS IS AMERICA in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Faith Lapidus. Roanoke Island is off the mid-Atlantic coast of the United States, in North Carolina. In fifteen eighty-seven, more than one hundred people arrived

发表于:2019-01-11 / 阅读(76) / 评论(0)

VOA慢速英语2008年（八）月

VOA慢速英语2009年-THIS IS AMERICA - America's 'Lost Colony':

VOICE ONE: Welcome to THIS IS AMERICA in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Faith Lapidus. Roanoke Island is off the mid-Atlantic coast of the United States, in North Carolina. In fifteen eighty-seven, more than one hundred peo

发表于:2019-01-11 / 阅读(50) / 评论(0)

VOA慢速英语2009年（八）月

美国国家公共电台 NPR Embryo Experiments Reveal Earliest Human Development, But Stir Ethical Debate

RACHEL MARTIN, HOST: Scientists doing embryo research are facing some sensitive questions over a new generation of scientific experiments, questions like how long should scientists be allowed to keep human embryos alive in their labs to study them? A

发表于:2019-01-16 / 阅读(54) / 评论(0)

2017年NPR美国国家公共电台3月

美国国家公共电台 NPR Editing Embryo DNA Yields Clues About Early Human Development

ARI SHAPIRO, HOST: For the first time, scientists have altered the DNA in human embryos to make a fundamental discovery about early human development. Scientists say this proves that modifying genes and human embryos can reveal powerful insights into

发表于:2019-01-16 / 阅读(42) / 评论(0)

2017年NPR美国国家公共电台9月

新西兰英语 164 Embryo donation

During the weekend, 2 couples and their families invited the media newspapers, TV and radio to interview them about embryo donation. The first couple had two teenage boys and the second couple had a 3-month old baby girl. Couple 1s 16 year old son wa

发表于:2019-02-06 / 阅读(42) / 评论(0)

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A. C. N.

admissible securities value

argyll-robertson

atrioventricular nodal rhythms