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.
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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