新编大学英语教程第四册Unit 13

[1] Overlooked in the arguments about the morality of artificially reproducing life is the fact that, at present, cloning is a very inefficient procedure. The incidence of death among fetuses and offspring produced by cloning is much higher than it i

【轻松英文阅读】拯救猛犸象

The woolly mammoth was a very large elephant-like mammal that lived on Earth several thousand years ago. Some mammoths grew to be four meters high and the largest weighed almost nine tons. Both male and female mammoths had very large tusks and walked

VOA慢速英语--新发现的骨骼显示古人类的基因组合

Newly Discovered Bones Show Genetic Mix of Ancient Human Relatives Scientists say they have discovered the remains of an ancient female whose mother was a Neanderthal and whose father was Denisovan. Neanderthals and Denisovans are early human species

美文欣赏：幸福的公式很简单基因 事件和价值

HAPPINESS has traditionally been considered an elusive and evanescent thing. To some, even trying to achieve it is an exercise in futility. It has been said that happiness is as a butterfly which, when pursued, is always beyond our grasp, but which i

SSS 2012-06-28

For many people summer equals tomatoes. Thats when folks can get their hands on gorgeous heirloom and traditional varieties, full of tomatoey flavor. Such tomatoes provide a stark contrast to year-round supermarket ones, famous for tasting like, well

美国英语听力80篇3 Lesson54

[00:04.91]54) Anti-sense Technology [00:10.55]Research scientists have reported success in using an experimental method [00:17.97]called anti-sense technology to treat people with cancer. [00:23.41]For years, researchers have tested anti-sense techno

异类之不一样的成功启示录 第7期:序言(7)

I remember going to Roseto for the first time, and you'd see three-generational family meals, all the bakeries, 我记得第一次来到罗赛托的时候，看到祖孙三代一起用餐, 看到很多面包师； the people walking up and down the s

TED演讲:个体DNA检测的时代来了(6)

A 16-year-old girl, a high school student from New York, Anna-Sophia Boguraev, 一个16岁的女孩，一个来自纽约的高中生，Anna-Sophia Boguraev， wondered whether changes to the DNA of astronauts could be related to this immune suppressi

TED演讲:论生物多样性(3)

We are living on a planet with a lot of activities, with reference to our living environment,done by faith and guess alone. 我们对于这个地球上所发生的许多现象,都只是通过信念或猜测来认知。 Our lives depend upon these cre

安琪拉·贝尔彻:用自然来培育电池

受到鲍鱼壳的启发，安琪拉贝尔彻用病毒来制造人类能使用的优雅的纳米结构。通过定向进化挑选出高性能基因，她生产出一种病毒，这种病毒能构筑强大的新的电池、清洁的氢燃料和破纪录

SSS 2009-07-03

This is Scientific American's 60-second Science. I'm Christie Nicholson. Got a minute? We might think perfect pitch is an innate talent. Well, a study in the American Journal of Human Genetics is providing some evidence for that. Perfect pitch, aka a

SSS 2010-08-06

One of the concerns about working with genetically modified crops has been that vegetation growing in agricultural fields might escape out into the world. Now, for the first time in the U.S., researchers report a large population of GM crops beyond t

SSS 2012-05-04

Heres a tale of genes, smells and pigs. Most people have two copies of a gene that enables them to detect a steroidal pheromone called androstenonewhich is found in male mammals, particularly porkers. But most pigs in developed countries have been ch

SSS 2012-05-03

Most people have two copies of a gene that enables them to detect a steroidal pheromone called androstenonewhich is found in male mammals, particularly porkers. But most pigs in developed countries have been chemically castrated. Which means much les

与美国小学生一起学英文第12册 第7期:突变

Mutation 突变 Do you know about mutations? 你知道突变吗？ A mutation happens when the DNA structure in a gene changes. 当基因的DNA结构发生变化时就会发生突变。 Once a mutation happens, the change can't be reversed. 突变一旦

为防癌变 朱莉切除卵巢和输卵管

Actress Angelina Jolie has had her ovaries and fallopian tubes removed as a preventative measure against cancer. 女星安吉丽娜朱莉摘除了卵巢和输卵管，以预防器官癌变。 Writing in the New York Times, Jolie said she chose to hav

万物简史 第441期:小生物的世界(12)

In the early days, this was an exceedingly painstaking process. 早年，这是个极费力气的过程。 Work on a single bacterium could easily consume a year. 研究一个细菌就可能一下子花掉一年时间。 At that time, according to Wo

万物简史 第453期:小生物的世界(24)

Viruses prosper by hijacking the genetic material of a living cell and using it to produce more virus. 病毒掠夺活细胞的基因材料，用来制造更多的病毒，从而大量生长。 They reproduce in a fanatical manner, then burst out in

实战口语情景对话 第265期:Trip to the Hospital 去医院

Adrienne: Hey, Ian, tell me about the time you were at the hospital. 埃德里安娜：嗨，伊恩，跟我说说你第一次去医院是什么时候吧。 Ian: What, the first time I went to the hospital? 伊恩：什么，我第一次去医院？

TED演讲:科学解释之新探(6)

If the axis-tilt theory had been refuted, 倘若地轴倾斜理论被观察否定了 its defenders would have had nowhere to go. 它的支持者们就无路可退了 No easily implemented change could make that tilt 没有什么信手拈来的变动能