1 in the past, but not now:
I went to Disney World once.
Going to the Olympics is a once-in-a-lifetime opportunity (= a rare and valuable one).
4 in the past, but not now:
5 as soon as, or when:
I did meet him once and it was an experience I shall never forget.
The baby only feeds once a night at the moment, thank goodness.
If I look flustered it's because I'm trying to do so many things at once.
She's decided to write her memoirs to set the record straight once and for all.
Cancer sufferers no longer face certain death as they once did.
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一次, 一次,一回, 過去…
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一次, 一次,一回, 过去…
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una vez, antes, en cuanto…
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uma vez, já, assim que…
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bir defa, bir kez, bir zamanlar…
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une fois, autrefois, une fois que…
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una vegada, abans, tan bon punt…
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