标签：胚胎 相关文章
A: Continuing with our class, today we are going to study briefly the miracle of life. Many of you may think you already know how babies come to be, but I am sure that some of the things that we will be talking about today may surprise you. Billy ，
纯正地道美语
Don: Time to go again to the A Moment of Science mailbox. A listener writers: Dear Don and Yal, I've had a problem with cavities all my life, so I'm wondering if there are any new dental techniques or discoveries that can help me prevent tooth decay?
英语时差8，16
Scientists Are Learning So Much About Dinosaur Nests 科学家深度研究恐龙巢穴 Tons of dinosaur fossils have been unearthed over the last hundred years. These long-buried bones tell us about the physical build and eating habits of dinosaurs.
初学者听力文摘精选
Karin Rodriguez never really worried about her weight until doctors told her it could interfere with the one thing she'd always wanted to become a mother. And you need to lose weight. There is no other option, you know. This is what you have to do to
万花筒2011年
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
健康与经济
By Melinda Smith Washington, DC 22 June 2006 watch Stem Cell report A new medical treatment injecting embryonic stem cells and other drugs into paralyzed mice has researchers wondering if it could eventually help humans suffering from Parkinson's an
2006年VOA标准英语（六月）
By Efam Dovi Accra 23 August 2006 In Ghana, a high court in the capital Accra Tuesday sentenced five robbers to more than 300 years in prison in what the police say is a clear sign the country is taking violent crime seriously. The spate of armed ro
2006年VOA标准英语（八月）
President Bush says he will veto legislation that would relax restrictions on embryonic stem cell research. There is growing bipartisan support in Congress for changing those rules. 布什总统表示他将否决要求放松对胚胎干细胞研究限制
VOA双语新闻 Bilingual News
He was the embryo of the very thing we were trying to do consciously. He had started with bossa nova, and he had added rhythm'n'blues and rock'n'roll to his thing. And he had a new synthesis that prefigured everything the Tropicalistas wanted to, to
自然百科2012年
Save the Eggs Vaccine makers crack the eggshell and inject the virus into the white stuff surrounding the yolk. Then they reseal the egg, the embryo becomes infected, and the virus is allowed to copy itself trillions of times over. And they use eggs
英语听力文摘 English Digest
By VOA News 20 November 2007 Two separate teams of scientists say they have transformed ordinary human skin cells into ones that look and act like embryonic stem cells. Laboratory teams at universities in the United States and Japan Tuesday announced
VOA常速英语2007年（十一月）
U.S. President Barack Obama has lifted restrictions on federal funding for medical research using human embryonic stem cells. Mr. Obama says it is part of a broader effort to limit political interference in science. 美国总统奥巴马解除对用政
VOA双语新闻 2009年3月
When you go to the pet store to pick out a new puppy, one of the first questions you may be asked is whether you want a male or a female. And when your friends have a new baby the first thing you find out is whether its a boy or a girl. We may be fam
英语时差8，16
In mammals, the sex of a baby is determined by the combination of chromosomes it inherits from its parents. Nearly every cell in a male body has two different sex chromosomesone is shaped like an X and one is shaped like a Y. Females also have two se
英语时差8，16