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美国英语听力80篇2 Lesson31

时间:2011-03-26 03:40来源:互联网 提供网友:rf855803   字体: [ ]
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[00:06.97]An Israeli study has shown that air pollution from cities and industry can reduce rain and snowfall.
[00:17.53]It says the problem appears to be linked to the number of pollution particles in clouds.
[00:24.82]Daniel Rosenfeld of Hebrew University in Jerusalem organized the study.
[00:32.24]His findings were reported in the publication Science.
[00:36.70]Mister Rosenfeld observed air pollution over Australia, Canada and Turkey from cities and factories.
[00:46.47]He used images provided by a satellite orbiting Earth.
[00:52.35]The satellite has instruments that can measure clouds and rainfall.
[00:58.57]Raindrops form in clouds with little or no pollution when water in the air collects around dust particles.
[01:09.07]The study notes that about 1,000,000 small droplets1 are required to form a drop of water large enough to fall to earth.
[01:20.04]Mister Rosenfeld observed the movement of the air pollution as it floated away from cities,
[01:28.89]power production centers and oil treatment centers.
[01:33.36]He found that heavily polluted clouds do not produce as much rain as cleaner clouds.
[01:40.94]He says this is because polluted clouds are made of only very small water droplets.
[01:49.58]Mister Rosenfeld says polluted clouds have too many dust particles.
[01:56.32]The large number of particles results in the formation of too many water droplets that are too small.
[02:05.26]They are not big enough to form raindrops.
[02:09.10]The smaller droplets also are slower to freeze and do not easily form ice particles for SHOW.
[02:19.10]Last year, Mister Rosenfeld found that burning trees and other plants also reduces rainfall amounts.


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1 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
参考例句:
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
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TAG标签:   美国英语听力
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