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昼夜是什么意思
更新时间: 2021-04-07 10:13:14  

1、释义:白日和黑夜。指代一切事物的两种相互对立、消长的力量,或阴阳两个方面。

2、当地球自转时,面向太阳之地面为昼,背向太阳之地面则为夜。昼夜是白天和黑夜的合称。昼夜交替是地球在太阳光的照射下,因自转运动而形成的一种自然现象。

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