单词:yolk nuclei
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[00:00.00]在线英语听力室( www.tingroom.com )友情制作 [00:03.81]1999 Passage4 [00:07.51]When a Scottish research team startled the world [00:10.54]by revealing 3 months ago [00:12.61]that it had cloned an adult sheep, [00:14.94]President Clinton move
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I'm sure that, throughout the hundred-thousand-odd years of our species' existence, and even before, 我十分确信在人类诞生以来的大概10万多年,甚至比这更长的时间里 our ancestors looked up at the night sky, and wondered what
OK, one more thing, if I can even get more bizarre. 另外还有一件事是更难以想象的 Since virtually all the mass of an atom is in the nucleus 既然事实是原子的全部质量集中在原子核, now, there is some amount of mass in th
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and h
Information Overload By Robert S. Boyd Knight Ridder Newspapers. Distributed by Tribune Media Services International. Are you overwhelmed by the amount of information these days? 1 Ever feel overwhelm
This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Athletes have obviously been tempted to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the perfo
Why are there males and females? Why are there two sexes instead of three, or twelve, or one? On this Moment of Science we'll learn why two is the magic number. Let's start with why there is sex at all. When two organisms reproduce sexually, sperm an
Science and Technolgy. 科技。 Modern alchemy. 现代炼金术。 Turning a line. 进入新的一行。 The race to extend the periodic table continues. 扩展元素周期表的比赛仍在继续。 ONE of the first inklings that chemistry has an u
91 李.卓维斯最新作品Key Monster AMERICAN MOSAIC - August 31, 2001 HOST: Welcome to AMERICAN MOSAIC VOA's radio magazine in Special English. (THEME) This is Bob Doughty. On our program today: W
Sometimes simple changes can bring about big results. When it comes to losing weight, more often than not, it's all about numbers. 有时简单的转变会带来大大的收获,每当说到减肥这个话题时,往往讲究的都是些数字。 I
This is Scientific American's 60-Second Science. I'm Steve Mirsky, got a minute? Neandertals were our closest relatives. And now we know a lot more about them. Because researchers have for the first time sequenced a complete Neandertal genomethat of
The source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into
New US Food Advice Not to Everyone's Taste Americans can eat eggs without feeling guilty, according to new nutritional guidelines issued by the U.S. government. A person can eat as many eggs as they like each day, the updated guidelines say. One larg
Science and Technology Stress and ageing A question of attitude 科技 压力和老化 一个态度问题 The link between chronic stress and a marker of old age is being disentangled 科学家发现了长期压力与一个衰老标志间的联系 TE
Questions 12-20 The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measur
BEIJING, Aug. 9 (Xinhuanet) -- There are three little-known effects about eggs, except its rich nutrition that is necessary for people. First, eating eggs can brighten your eyes. Those who eat eggs every day have little risk for cataract according to
First, a video. Yes, it is a scrambled egg. But as you look at it, I hope you'll begin to feel just slightly uneasy. 首先,来段录像。对,这是个被搅拌的鸡蛋。但是,当你看它的时候,我希望你能开始感受到有一点点