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SSS 2011-02-21

时间:2011-03-04 05:49来源:互联网 提供网友:yw7514   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 Steve Mirsky. Got a minute?

"It took until about 1800 or 1825 to put the first billion people on the planet. We added the most recent billion in 12 or 13 years. We anticipate two billion more by 2050."

That's Joel Cohen, head of the Laboratory of Populations at Rockefeller University in New York. He spoke1 February 20th at the annual meeting of the American Association for the Advancement2 of Science in Washington, DC. So how many people can the earth hold?

"In the last half century, people have estimated human carrying capacities for the earth that have ranged from less than one billion to more than a trillion. They can't all be right. In fact, those numbers are political numbers, not scientific numbers. Because the question how many people can the earth support is an incomplete question, and doesn't take account of with what technologies, at what average level of well-being3, with what distribution of income, with what political and economic institutions."


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1 spoke XryyC     
n.(车轮的)辐条;轮辐;破坏某人的计划;阻挠某人的行动 v.讲,谈(speak的过去式);说;演说;从某种观点来说
参考例句:
  • They sourced the spoke nuts from our company.他们的轮辐螺帽是从我们公司获得的。
  • The spokes of a wheel are the bars that connect the outer ring to the centre.辐条是轮子上连接外圈与中心的条棒。
2 advancement tzgziL     
n.前进,促进,提升
参考例句:
  • His new contribution to the advancement of physiology was well appreciated.他对生理学发展的新贡献获得高度赞赏。
  • The aim of a university should be the advancement of learning.大学的目标应是促进学术。
3 well-being Fe3zbn     
n.安康,安乐,幸福
参考例句:
  • He always has the well-being of the masses at heart.他总是把群众的疾苦挂在心上。
  • My concern for their well-being was misunderstood as interference.我关心他们的幸福,却被误解为多管闲事。
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