短寿命衰变产物的α潜能

SSS 2010-02-18

Welcome to the Science Talk, the weekly podcast of Scientific American posted on February 18th, 2010. I am Steve Mirsky. And you know what the hottest sport in the world is right now? Thanks to the Winter Olympics, it is, of course, curling. That's t

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Scientific American(二)月

【英语时差8,16】势能

Potential energy in a crossbow When we think of the concept of energy, we often think of objects in motion: a car rolling down a hill or a jogger running up a hill. This kind of energy-in-motion, called kinetic energy, isnt the only kind of energy. A

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英语时差8，16

奥巴马每周电视讲话：总统呼吁确保美国引领世界开拓新边疆（03）

And it's why, over the last eight years, we've modernized the government's approach to innovation for the 21st Century. 也因此,在过去的8年里,我们让政府在21世纪的创新方式上现代化。 We've jumpstarted a clean energy revolution

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奥巴马每周电视讲话

英语名篇名段背诵精华63 To Daffodils

To daffodils Fair daffodils，we weep to see you haste away so soon； as yet the early-rising sun has not attain'd his noon. Stay，stay， until the hasting day has run but to the even-song； and，having pray'd together， we will go with you along. We

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英语名著名段背诵精华

英语访谈对话 45 Great State

Todd: OK. Hey, hello! Tim: Hey, how's it going? Todd: Doing pretty good. Could you introduce yourself please? Tim: Yeah, I'm Tim Peterson. I'm from Oregon in the United States. Todd: Oh, nice. You're from Oregon. Tim: Yeah. Todd: OK, and were you bor

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英语访谈对话

英语诗歌:To Daffodils

Robert Herrick (1591-1674) Fair Daffodils, we weep to see You haste away so soon: As yet the early-rising Sun Has not attained his Noon. Stay, stay, Until the hasting day Has run But to the Even-song; And, having prayed together, we Will go with you

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英语诗歌

VOA慢速英语--William Henry Harrison: Short-Lived

VOA Learning English presents Americas Presidents. Today we are talking about William Henry Harrison. Although he was elected in 1840, many Americans still remember his catchy campaign slogan: Tippecanoe and Tyler, too. Tyler referred to John Tyler,

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2017年VOA慢速英语(四)月

2015年CRI ＂Reactor Relevant＂ Fusion, a Potential Game Changer in Energy Production

Fusion is how stars produce energy. It occurs when the nuclei of light atoms, such as hydrogen, are fused together under extreme pressure and heat. Tokamak Energy, from Oxfordshire, believes that the third version of their compact, spherical tokamak

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2015CRI中国国际广播电台

TED演讲:怎样让企业持续运行100年(4)

Let's come back to our tech CEO's question. 再来说说科技公司老板的问题 Where better to turn for advice than nature, 哪里有向比大自然求教更好的呢？ that's been in the business of life and death for longer than any company? 大

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TED演讲科学篇

英文原版对话1000个:1045 Great State

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原版英语对话1000个

原版英语对话1000个:045 Great State

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原版英语对话1000个

情景会话口袋书人际篇第581期:策略制订(3)

9. Then the salesmen have to refresh themselves frequently since we keep producing new products. 我们不断生产新产品，因此销售人员必须经常更新自己。还能这样说： The salesmen have to keep constant refreshing as we always

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情景会话口袋书人际篇

希望长着翅膀20 To Daffodils

20 To Daffodils Robert Herrick Fair daffodils, we weep to see You haste away so soon; As yet the early-rising sun Has not attained his noon. Stay, stay, Until the hasting day Has run But to the even-song; And, having prays together, we Will go with

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希望长着翅膀

情景交际-中国式离婚

D: everything's great. And you? M: same here. Have you seen any new films recently? D: no, I haven't had a chance to. But I've been watching a Chinese TV series called Chinese-Style Divorce. M: oh, really? I saw it two years ago. It's worth seeing an

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英语口语

How to Create Passion Anywhere and Anytime

How to Create Passion Anywhere and Anytime Remember Science class? Mr. Thatcher, sophomore year in high school, taught us about potential and kinetic energy. I was way more interested in Pam Miller, who sat perilously close to me. But on Mr Thatcher

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阅读空间

科学美国人60秒 SSS 通过腐肉可洞察石化过程

Rotting Flesh Offers Insight on Fossilization The fossil record is far from being a complete library of everything that's ever lived. 化石记录不止是曾经存活生物的藏书阁. The vast, vast majority of everything that's ever lived has com

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2018年科学美国人3月

【英语时差8，16】荡秋千

Sit on a swing, let someone push you, and away you go. But what happens if the person who pushed you walks away, and you want to swing faster and higher. If you've ever been in the second grade, you know the solution to that. Just start pumping your

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英语时差8，16

【英音模仿秀】英超开始魔鬼赛程利物浦成焦点

模仿文本： The short answer is probably yes, but not necessarily in terms of the way they perform. I mean, we're almost at the midway point of the season, one more match and we will be. So I don't think there's any more such a thing as a potenti

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英音模仿秀

双语有声阅读：咏黄水仙花 To daffodils

To daffodils 咏黄水仙花 robert herrick 罗伯特哈里克 fair daffodils,we weep to see 美的黄水仙，凋谢的太快， you haste away so soon; 我们感觉着悲哀； as yet the early-rising sun 连早晨出来的太阳 has not attain'd h

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双语有声阅读

跟Susan一起学美语第10期:中国经典智慧之寒蝉和灵龟

寒蝉和灵龟 The Winter Cicada and the Wonder Tortoise 世人都说彭祖活了八百岁，是人间最长寿的了。 People say that once there was a man named PengZu, who at 800 years old had lived the longest life ever. 但有一种小虫叫做朝

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