2016中国珠宝市场份额:riddle:why do birds fly south for winter

来源：百度文库 编辑：杭州交通信息网 时间：2024/05/11 14:06:10

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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