每天英语背诵 (ZT)

The annual migrations of wildfowl and many other animals certainly cannot be regarded as a form of exploration, because such movements are actually only shifts from one habitat to another for the purpose of avoiding seasonal climatic variations.

野生禽类和许多其他动物每年的迁徙，当然不能被看做是一种探险行为，因为，这些迁徙活动实际上只是从一个栖息地转移到另一个栖息地，以躲避气候的季节性变化。

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详细出处参考：http://www.hxen.com/meitianyingyu/2009-01-19/66337.html