铱星手机上网:riddle:why do birds fly south for winter

来源：百度文库 编辑：中科新闻网 时间：2024/07/01 14:05:41

Because it's too slow to walk there.

？？？
我小学毕业你说的什么我NO指导

the reason ?south is warmer than north in winter.cofcouse ,it's in china

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