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为什么地球有昼夜交替？

地球有昼夜交替是因为地球自转的原因。地球以自己轴心为转轴，每天绕着太阳旋转一周，完成一次自转。地球在自转的过程中，由于自转轴的倾斜，使得地球不同地区在不同时间面向太阳，所以我们才会有昼夜交替。

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