氧同位素纪录

SSS 2011-07-05

This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. If youve ever wondered where the Earth came from, the answer, it seems, is blowin in the windthe solar wind. Or so say scientists who, after examining sola

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VOA慢速英语 2007 0620b

VOICE ONE: I'm Barbara Klein. VOICE TWO: And I'm Steve Ember with EXPLORATIONS in VOA Special English. Today, we tell Mount Everest about efforts to climb Mount Everest. Last month, an eighteen-year-old American became one of the youngest people to

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万物简史第487期:多灾多难的生命进程(7)

And how, you may reasonably wonder, can scientists know what oxygen levels were like hundreds of millions of years ago? 你也许有理由想知道，科学家们怎么会知道几亿年以前的氧气浓度？ The answer lies in a slightly obscure b

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万物简史

万物简史第488期:多灾多难的生命进程(8)

By combining their isotope findings with other fossil residuespollen levels and so on, 把对同位素测量的结果和能够说明其他情况（如花粉浓度等）的别的化石残留物结合起来， scientists can, with considerable confiden

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万物简史

【英语时差8，16】魔术师打破憋气时间世界纪录

Magician David Blaine set a new world record last month for breath-holding: 17 minutes and 4 seconds. The feat was broadcast live during The Oprah Winfrey Show, and the studio audience cheered as divers pulled Blaine from a water-filled sphere. He lo

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英语时差8，16

英语听力：探索发现科学新发现：我们的大气层-9

We were left with this atmosphere made of molten rock and vaporous rock. It took millions of years for that atmosphere to fall out and to be replaced by an atmosphere made up of nitrogen and carbon dioxide and water vapour. These new gases came from

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ampulla of vas deferens

anafranil (clomipramine)