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为什么会发生季节更替？

季节更替是由地球公转和倾斜造成的。地球公转轨道是个椭圆形，而不是完全圆形，这意味着在不同时间地球离太阳的距离会有变化。当地球离太阳较近的时候，就是夏季，太阳辐射的能量更强，导致气温升高。而当地球离太阳较远的时候，就是冬季，太阳辐射的能量减弱，气温下降。

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