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IELTS BNC: 548 COCA: 300
onceadverbuk/wʌns/ us/wʌns/

once adverb ONE TIME

A2 one single time一次，一回

I went sailing once, but I didn't like it.我玩过一次帆船，不过我不喜欢。
We have lunch together once a month.我们每个月在一起吃一次午餐。
at once

C1 at the same time同时

They all started talking at once.他们同时开始讲起话来。
for once

B2 used when something happens that does not usually happen难得一次

For once, the bus came on time.难得一次公共汽车准点到达。
just this once

used to say that you will only do or request something on this particular occasion就这一次，仅此一回

All right, I'll lend you the money - just this once.好吧，我把钱借给你——仅此一回。
once again also once more

B1 again, as has happened before再次，又一次

Once again, racist attacks are increasing across Europe.种族主义攻势在整个欧洲又开始抬头。
once more

B1 one more time再一次

I'd like to visit the campus once more before we leave.我想在我们离开之前再去参观一下大学。

again, as has happened before再次，又一次

When my father came home, everything felt right once more.当父亲回到家时，一切又变好了。
once or twice

a few times几次，一两次

I've seen him once or twice in town.我在城里见过他几次。
(every) once in a while

B2 sometimes but not often偶尔，间或；有时

We meet for lunch once in a while.我们偶尔见面吃顿午餐。
once and for all

C2 completely and in a way that will finally solve a problem彻底了结地；一劳永逸地

Our intention is to destroy their offensive capability once and for all.我们的目的是彻底摧毁他们的进攻能力。
once in a lifetime

only likely to happen once in a person's life一生只有一次；千载难逢地；难得地

An opportunity as good as this arises once in a lifetime.像这样好的机会可是千载难逢呀。
See also
once-in-a-lifetime
the once

UK on a single occasion一次，一回

I've only played rugby the once, and I never want to play it again.我只打过一次橄榄球，我再也不想打了。

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.

once adverb PAST

B1 in the past, but not now从前，以前；曾经，一度

This house once belonged to my grandfather.这所房子曾属于我的祖父。
Computers are much cheaper nowadays than they once were.如今计算机要比以前便宜多了。
Once-thriving villages stand deserted and in ruins.昔日繁荣的村庄今遭废弃，满目疮痍。

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.

Idiom(s)

once upon a time
onceconjunctionuk/wʌns/ us/wʌns/

B2 as soon as, or from the moment when一…就；一旦…就

Once I've found somewhere to live I'll send you my address.我一找到住的地方就把地址告诉你。
Remember that you won't be able to cancel the contract once you've signed.记住一旦你签了字就不能取消合同了。
at once

B1 immediately立刻，马上

I knew at once that I'd like it here.我立刻知道我会喜欢这里的。

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.

Idiom(s)

all at once
once bitten, twice shy

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