新都区蜀都卫生院:riddle:why do birds fly south for winter
来源：百度文库 编辑：高校问答 时间：2024/05/17 02:34:27
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
riddle:why do birds fly south for winter
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why do you do that?同义句
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