Definition
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once
Once refers to a single time or occasion in the past or future.
一次指过去或将来的单次时刻或场合。
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I only visited that city once.
我只去过那座城市一次。
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Once you finish your homework, you can play outside.
一旦你完成作业,就可以出去玩。
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He called me once last week.
他上周只给我打过一次电话。