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SSS 2009-06-16

时间:2010-05-18 02:52来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-second Science. I'm Karen Hopkin. This will just take a minute.

About a billion years from now, some scientists say, the sun will be too bright for comfort, and our formerly1 hospitable2 planet will no longer be able to support life. If visions of this impending3 heat death disturb you, researchers from the California Institute of Technology have some good news. Their calculations add at least another billion years to Earth’s expiration4 date, results published in the Proceedings5 of the National Academy of Sciences.

As our sun matures it grows brighter and hotter. And over the past three or four billion years, the Earth’s been coping with the extra rays by getting rid of some of the CO2 in the atmosphere. Thinning out the CO2 that blankets the earth helps to keep things cool. But that can’t go on forever because we’d be left with no blanket at all.

Now the Caltech scientists say that the planet may be able to compensate6 by removing nitrogen from the atmosphere. That’ll decrease atmospheric7 pressure, which will then loosen the weave of the CO2 blanket and allow more heat to escape. So stop and smell the roses. We may have an additional billion years to figure out this extreme case of global warming.

Thanks for the minute for Scientific American's 60-second Science. I'm Karen Hopkin.

 


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1 formerly ni3x9     
adv.从前,以前
参考例句:
  • We now enjoy these comforts of which formerly we had only heard.我们现在享受到了过去只是听说过的那些舒适条件。
  • This boat was formerly used on the rivers of China.这船从前航行在中国内河里。
2 hospitable CcHxA     
adj.好客的;宽容的;有利的,适宜的
参考例句:
  • The man is very hospitable.He keeps open house for his friends and fellow-workers.那人十分好客,无论是他的朋友还是同事,他都盛情接待。
  • The locals are hospitable and welcoming.当地人热情好客。
3 impending 3qHzdb     
a.imminent, about to come or happen
参考例句:
  • Against a background of impending famine, heavy fighting took place. 即将发生饥荒之时,严重的战乱爆发了。
  • The king convoke parliament to cope with the impending danger. 国王召开国会以应付迫近眉睫的危险。
4 expiration bmSxA     
n.终结,期满,呼气,呼出物
参考例句:
  • Can I have your credit card number followed by the expiration date?能告诉我你的信用卡号码和它的到期日吗?
  • This contract shall be terminated on the expiration date.劳动合同期满,即行终止。
5 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
6 compensate AXky7     
vt.补偿,赔偿;酬报 vi.弥补;补偿;抵消
参考例句:
  • She used her good looks to compensate her lack of intelligence. 她利用她漂亮的外表来弥补智力的不足。
  • Nothing can compensate for the loss of one's health. 一个人失去了键康是不可弥补的。
7 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
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