因为地球自转，它被太阳照亮的一侧是是白天，而处在黑暗中的一侧是夜晚。
As the earth rotates, its side that is lighted by the sun is day time, while its side that is in darkness is night time.
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它的光明，白天和黑暗的夜晚。
It's bright by day and dark by night.
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