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托福听力短文 I-11-3

时间:2009-01-10 01:40来源:互联网 提供网友:Zoe-w   字体: [ ]
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    (单词翻译:双击或拖选)
(Woman) Today I want to talk about the Earth's last major climatic shift, at the end of the last ice age.

But first, let's back up a moment and review what we know about climatic change in general. First, we defined "climate" as consistent patterns of weather over significant periods of time.

In general, changes in climate occur when the energy balance of the Earth is disturbed. Solar energy enters the Earth's atmosphere as light and is radiated by the Earth's surface as heat. Land, water, and ice each affect this energy exchange differently. The system is so complex that, to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.

Of course, that doesn't keep us from speculating. For instance, volcanic1 activity is one mechanism2 that might affect climatic change. When large volcanoes erupt, they disperse3 tons of particles into the upper atmosphere, where the particles then reflect light. Since less light is entering the system of energy exchange, the result would be a cooling of the Earth's surface.

Of course, this is just one possible mechanism of global climate change. In all probability, a complete explanation would involve several different mechanisms4 operating at the same time.

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1 volcanic BLgzQ     
adj.火山的;象火山的;由火山引起的
参考例句:
  • There have been several volcanic eruptions this year.今年火山爆发了好几次。
  • Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。
2 mechanism zCWxr     
n.机械装置;机构,结构
参考例句:
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
3 disperse ulxzL     
vi.使分散;使消失;vt.分散;驱散
参考例句:
  • The cattle were swinging their tails to disperse the flies.那些牛甩动着尾巴驱赶苍蝇。
  • The children disperse for the holidays.孩子们放假了。
4 mechanisms d0db71d70348ef1c49f05f59097917b8     
n.机械( mechanism的名词复数 );机械装置;[生物学] 机制;机械作用
参考例句:
  • The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
  • He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》
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TAG标签:   托福听力  托福短文
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