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ADV
在整個夜間；在夜里的某一時刻
If something happens overnight, it happens throughout the night or at some point during the night.
例句
The weather remained calm overnight...
整晚都悄然無風。
The decision was reached overnight...
決定是在夜里作出的。
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ADV
突然；一下子；一夜之間
You can say that something happens overnight when it happens very quickly and unexpectedly.
例句
The rules are not going to change overnight...
這些規定不會說變就變。
He's realistic enough to know he's not going to succeed overnight...
他很現實，知道自己的成功不會一蹴而就。
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ADJ
只供一兩晚使用的
Overnight bags or clothes are ones that you take when you go and stay somewhere for one or two nights.
例句
He realized he'd left his overnight bag at Mary's house.
他意識到自己把過夜包落在瑪麗家了。
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VERB
過夜
If you overnight somewhere, you spend the night there.
例句
They had told her she would be overnighting in Sydney.
他們跟她說過她將在悉尼過夜。