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IELTS BNC: 548 COCA: 300

once

Word family
once1 /wʌns/ ●●● S1 W1 adverbadv
1 ONCEon one occasion only 一次,一回
I’ve only met her once.
我只見過她一面。
Paul’s been to Wexford once before.
保羅曾去過韋克斯福德一次。
(just) the once British EnglishBrE spoken
Mrs Peterson came in to see Ruth just the once.
彼德森太太僅僅來看過露絲一次。
2 once a week/once every three months etc REGULARone time every week etc, as a regular activity or event 每周一次/每三個月一次等
Staff meetings take place once a week.
員工會議每周舉行一次。
They took separate holidays at least once every two years.
他們每兩年至少有一次各自去度假。
3 PASTat some time in the past, but not now 曾經,以前
Sonya and Ida had once been close friends.
索尼娅和艾達曾經是很要好的朋友。
She and her husband had once owned a house like this.
她和她丈夫曾經也有過這樣的房子。
once-great/proud etc
It was sad to see the once-great man looking so frail.
看到曾經的偉人如此脆弱,真讓人難過。
the once-mighty steel industry
一度輝煌的鋼鐵工業
4 in the past, at a time that is not stated 過去,曾經
I once ran 21 miles.
我曾經跑過21英裏。
Marx once described religion as the ‘opium of the people’.
馬克思曾把宗教稱爲人民的鴉片
5 at once 
a) IMMEDIATELYimmediately or without delay 立刻,馬上
Now, go upstairs at once and clean your room!
現在立刻上樓去打掃你的房間!
When I saw him I recognized him at once.
一看到他我就認出他了。
b) TIME/AT THE SAME TIMEtogether, at the same time 一起,同時
I can’t do two things at once!
我不能同時做兩件事!
Don’t all talk at once.
不要同時發言。
Register
In everyday English, when people mean 'immediately', they usually say right away or, in British English, straight away rather than at once: 在日常英語中,人們表示立刻時一般說right awaystraight away(英國英語),而不說at once
I recognized him right away.
我立刻認出了他。
Examples from the Corpus
6 once more/once again AGAIN
a) again, after happening several times before 再次〔發生〕,又一次
I looked at myself in the mirror once more.
我再看了一眼鏡子裏的自己。
Once again she’s refusing to help.
她再一次拒絕幫助。
b) used to say that a situation changes back to its previous state 再次〔回到原來狀態〕
The crowds had all gone home and the street was quiet once more.
衆人都回家去了,街上恢複了甯靜。
c) formal used before you repeat something that you said before 再說一次,重複說一遍
Once again, it must be stressed that the pilot was not to blame.
再說一遍,必須強調的是飛行員沒有責任。
7 all at once 
a) SUDDENLYif something happens all at once, it happens suddenly when you are not expecting it 一下子,突然
All at once there was a loud banging on the door.
突然傳來一記重重的敲門聲。
b) together, at the same time 一起,同時
A lot of practical details needed to be attended to all at once.
許多實際上的細節問題都需要同時處理。
Examples from the Corpus
8 (every) once in a while SOMETIMESsometimes, although not often 偶爾,有時,間或
I do get a little anxious once in a while.
我的確偶爾會有點焦慮。
I saw her in the shop every once in a while.
有時我在商店裏看到她。
Examples from the Corpus
9 never once/not once used to emphasize that something has never happened 從未,從來沒有
I never once saw him get angry or upset.
我從未見過他生氣或不快。
Not once did they finish a job properly.
他們從來沒有把一件事情做好過。
10 (just) for once RARELYused to say that something unusual happens, especially when you wish it would happen more often 難得一次,就這一回
Be honest for once.
誠實點,哪怕就這一次。
Just for once, let me make my own decision.
就這一次讓我自己作決定吧。
For once Colin was speechless.
科林這一次無話可說。
Examples from the Corpus
11 once and for all 
a) CHANGE/MAKE something DIFFERENTif you deal with something once and for all, you deal with it completely and finally 徹底地,一勞永逸地
Let’s settle this matter once and for all.
我們把這個問題徹底解決了吧。
b) British EnglishBrE spokenTELL/ORDER somebody TO DO something used to emphasize your impatience when you ask or say something that you have asked or said many times before 最後一次〔強調不耐煩〕
Once and for all, will you switch off that television!
最後說一次,把那電視關掉!
Examples from the Corpus
12 once or twice FEW/NOT MANYa few times 一兩次,幾次
I wrote to him once or twice, but he didn’t answer.
我給他寫過一兩次信,但他沒有回複。
Examples from the Corpus
13 (just) this once spokenONLY used to emphasize that this is the only time you are allowing something, asking for something etc, and it will not happen again 就這一次
Go on, lend me the car, just this once.
好啦,把車借給我吧,就這一次。
I’ll make an exception this once.
這次我就破個例。
Examples from the Corpus
14 once upon a time 
a) spokenPAST at a time in the past that you think was much better than now 以前,從前,那時候〔指比現在好得多的過去某一時期〕
Once upon a time you used to be able to leave your front door unlocked.
從前,大門是可以不上鎖的。
b) RFa long time ago – used at the beginning of children’s stories 從前,很久以前〔用於兒童故事的開頭〕
Examples from the Corpus
15 once in a blue moon informalRARELY very rarely 難得地,破天荒地
It only happens like this once in a blue moon.
這樣的情況是極爲罕見的。
Examples from the Corpus
16 do something once too often HARM/BE BAD FORto repeat a bad, stupid, or dangerous action with the result that you get punished or cause trouble for yourself 屢次做壞事[傻事,危險之事]而遭殃
He tried that trick once too often and in the end they caught him.
他一次次故伎重施,最後他們終於把他抓住了。
Examples from the Corpus
17 once a ..., always a ...always a ... once a ... spoken used to say that people stay the same and cannot change the way they behave and think 一次是就永遠是〔表示一個人的品性是無法改變的〕
Once a thief, always a thief.
一日爲賊,終生是賊。
18. once is/was enough spoken used to say that after you have done something one time you do not need or want to do it again 一次就夠了〔表示你不需要或不想再做了〕
19. once bitten, twice shytwice shy once bitten NOT DO somethingused to say that people will not do something again if it has been a bad experience 一朝被蛇咬,十年怕井繩
Examples from the Corpus
once2 ●●● S1 W1 conjunction
HAPPENfrom the time when something happens 便,一旦,一經
Once I get him a job, he’ll be fine.
一旦我幫他找到了工作,他就會好的。
Once in bed, the children usually stay there.
孩子們一旦上了床,一般就不下來了。
Examples from the Corpus
Origin once1
(1200-1300) one
IELTS BNC: 548 COCA: 300
IELTS BNC: 548 COCA: 300
once adv.
once in a while sometimes
IELTS BNC: 548 COCA: 300
once
Happening only once: once, isolated, unrepeatable...
After another event or time: after, following, since...

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