A2 one single time一次,一回
B2 used when something happens that does not usually happen难得一次
used to say that you will only do or request something on this particular occasion就这一次,仅此一回
B1 again, as has happened before再次,又一次
B1 one more time再一次
again, as has happened before再次,又一次
B2 sometimes but not often偶尔,间或;有时
C2 completely and in a way that will finally solve a problem彻底了结地;一劳永逸地
only likely to happen once in a person's life一生只有一次;千载难逢地;难得地
UK on a single occasion一次,一回
More examples
I go to aerobics once a week.
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.
B1 in the past, but not now从前,以前;曾经,一度
More examples
Turkey was once an important colonial power.
England was once a densely wooded country.
Cancer sufferers no longer face certain death as they once did.
Shops of this type, once rare, are now numerous.
An article on this topic would once have been considered off limits.
B2 as soon as, or from the moment when一…就;一旦…就
More examples
Decoding the paintings is not difficult once you know what the component parts symbolize.
You'll feel better once you've got some hot soup down you.
We can't afford to make any false moves once we're in enemy territory.
Fourteen miles is further than you'd think once you start to run it.
My new hiking boots will be great once I've broken them in.
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