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Day and night alternate.是什么意思？

Day and night alternate.

昼夜更替。

相关词汇
day and night alternate

day

n. 一天，白天，时期，节日；adj. 日间的，逐日的；adv. 每天，经常在白天地；

and

conj. 和，与，而且，于是，然后，因此；

night

n. 夜，晚上，（举行盛事的）夜晚；

alternate

adj. 轮流的，交替的，间隔的，代替的；vi. 交替，轮流；vt. 使交替，使轮流；n. 〈美〉（委员）代理人，候补者，替换物；
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他坐在那儿，听我陈述解雇他的理由。
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