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英语听力：2012-02-05 从南极到北极 From Pole To Pole—9

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（单词翻译）

 The advance of the seasons brings constant change. As the sun’s influence diminishes in the north, so the deciduous1 forests of America begin to shut down, losing their leaves in preparation for the dark, cold months ahead. One season hands over to another. Some organisms thrive on decay. But this must make special preparations for winter and a

 
life with little sun. Whole populations of animals are now forced to travel great distances in pursuit of food and warmth. Three hundred thousand Baikal teal gather to escape from the Siberian winter by migrating south to Korea, the world’s entire population in a single flock. 
 
But there are parts of the world that have no seasons. In the tropics, the sun’s rays strike the earth head on and their strength is more or less constant all year round. That is why the jungle grows so vigorously and supports so much life. This forest covers only three percent of the planet’s surface but it contains more than fifty percent of all its plants and animals. The canopy2 is particularly rich. There are monkeys, birds and millions of species and insects, exactly how many we have no idea.

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1 deciduous 992yy     
adj.非永久的；短暂的；脱落的；落叶的
参考例句：
  • Overgrown deciduous shrubs can be cut back at this time of year.过于繁茂的落叶灌木可以在每年的这个时候修剪。
  • Deciduous trees shed their leaves in autumn.落叶树木在秋天落叶。
2 canopy Rczya     
n.天篷，遮篷
参考例句：
  • The trees formed a leafy canopy above their heads.树木在他们头顶上空形成了一个枝叶茂盛的遮篷。
  • They lay down under a canopy of stars.他们躺在繁星点点的天幕下。

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