脉动应力下的疲劳极限

SSS 2008-07-31

This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Tricky cyclists in the Tour de France sometimes cheat by upping their red blood cell count for those tough stretches through the Alps. But researchers at Calif

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CNN 2010-10-03

Declassify US government documents and witness testimony from former or retired US military personnel confirm beyong any doubt the reality of ongoing UFO incursions at nuclear weapon sites. When I say UFO, the witnesses have described this craft as d

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We're going to go on a dive to the deep sea, 好了，我们即将潜入海底深处。 and anyone that's had that lovely opportunity knows that for about two and half hours on the way down, 任何一个有过这种美妙机会的人都知道，在这两

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TED演讲教育篇

乔布斯传第176期:一落千丈

Falling 一落千丈 After the burst of excitement that accompanied the release of Macintosh, 麦金塔电脑刚发布时引发了一阵热潮， its sales began to taper off in the second half of 1984. 但到1984年下半年，其销量就开始急剧

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乔布斯传

Athletic Bilbao qualify for Europa League final

BILBAO, Spain, April 26 (Xinhua) -- Fernando Llorente scored a last minute goal to qualify Athletic Club Bilbao for the final of the Europa League on Thursday. Llorente forced the ball home from close range following great work from Ibai Gomez to giv

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【英语趣味课堂】最喜爱的橄榄球-Rugby

Todd: Hey, Shawn you're a big guy. Shawn: Thank you. Todd: Do you play rugby? Shawn: I did in the past. Todd: OK, how does rugby work? Shawn: It's a bit like American football and soccer put together. It's, the ball's about the size of an American fo

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