考研背诵50篇——14 A Rare Fossil Record

The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be fossilized. Ichthyosaurs had a higher chance of being

新东方现代文背诵篇章 A Rare Fossil Record

The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be foss

VOA慢速英语-Health Report - Cancer Stem Cells Capture Attention

Evidence is seen for a possible cause of solid tumors, but many questions remain. Transcript of radio broadcast: 24 June 2008 This is the VOA Special English Health Report. Some experts predict that doctors will someday use stem cells to treat many

VOA常速英语2015--试管狗崽挽救濒危品种

试管狗崽挽救濒危品种 These playful puppies are part of litter of seven, born July 10, out of 19 embryos implanted in the same female dog. Five are beagles and two are beagle-cocker spaniel mixes. 7月10日，一窝狗崽出生，研究人员将

美国国家公共电台 NPR Technology May Rescue Male Baby Chicks From The Grinder

Technology May Rescue Male Baby Chicks From The Grinder play pause stop mute unmute max volume 00:0003:34repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.

美国国家公共电台 NPR Chinese Scientist Says He's First To Create Genetically Modified Babies Using CRISPR

DAVID GREENE, HOST: A Chinese researcher is claiming to have created the world's first genetically edited human babies. According to the scientist, the genes of two twin girls have been modified to resist HIV infection. That's the virus that causes A

英文书摘精选 科学家深度研究恐龙巢穴

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.

联合国通过了禁止克隆的一项非强制性决议

UN Approves Non-Binding Resolution on Cloning 联合国通过了禁止克隆的一项非强制性决议 A deeply divided U.N. General Assembly has approved a U.S.-backed declaration urging governments

VOA标准英语2008年-British Lawmakers Pave Way for New Genetic Rese

By Tom Rivers London 19 May 2008 British lawmakers voted Monday to allow the use of animal-human hybrid embryos in stem cell research. These new embryos will be created in labs injecting empty animal eggs with human genetic material. For VOA, Tom Riv

VOA标准英语2009年-US Researchers Welcome Obama Stem-Cell Decision

Medical experts in Miami are hoping to speed up research using embryonic stem cells. Their work may lead to advances in treatment for spinal cord injuries, Alzheimer's disease and other illnesses. President Barack Obama signs an Executive Order on s

VOA标准英语2010年-BP Well Capped, Gulf Oil Cleanup Conti

The Macondo well operated by BP in the Gulf of Mexico has now been capped with a star adornment that commemorates the 11 people killed when the rig operating on the water surface above the site exploded on April 20. Clean-up efforts continue, though,

VOA常速英语2015--试管小狗的成功可拯救濒临灭绝动物

Test Tube Pups May Help Rescue Endangered Species 试管小狗的成功可拯救濒临灭绝动物 Scientists at Cornell University have proudly presented the first litter of dogs successfully born through in vitro fertilization, or IVF. The breakthr

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

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

美国科学60秒 SSS 2013-06-06

Most birds don't have penises. Good, I have your attention. Of course, female birds don't have penises. But, neither do most males. Now researchers have unravel the genetics behind the dispearance of this anatomical apparatus. Their penetrating insig

VOA常速英语2007-Conference Says Stem Cell Research is Robust

By Victoria Cavaliere New York 16 October 2007 An annual stem cell research conference in New York has been bringing together some of the field's top scientists to discuss breakthroughs in stem cell research and what proponents call its long-term app

VOA常速英语2007年-Scientists Reprogram Skin Cells to Act Like Emb

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

美国有线新闻 CNN 世界首例基因编辑婴儿在中国出生 国内外科学家纷纷谴责

CARL AZUZ, CNN 10 ANCHOR: A passionate debate is taking place worldwide over claims that genetically edited human children were recently born in China. I'm Carl Azuz. This is CNN 10. Here's how the debate got started. A Chinese scientist named He Jia

VOA双语新闻：奥巴马取消干细胞研究受到的限制

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

【英语时差8,16】如何界定性别？

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