once

[wʌns]

adv.一次, 曾经
conj.一旦
n.一次
adj.曾经的

ad.

1. 一次, 一回

I see them once every two months.

我每两个月与他们见一次面。

2. 昔日, 曾经

He once knew her, but they are no longer friends.

他以前认识她, 但他们已经不是朋友了。

n.

一次, 一回

Once is enough.

一次就够了。

conj.

一旦, 一经……便

Once you get into a bad habit, you'll find it hard to get out of it.

一旦染上坏习惯, 想改掉就难了。

词义辨析

同义:

ad.从前地

previously  aforetime  heretofore  in the past  at one time  long ago

ad.一度, 一次

single time  one time  on one occasion  one time only  never again

ad.曾经, 一度

ever  at any time  at a single time  by chance  by a fluke

n.一次

single  occasion  single time  one time only  

同义参见:

formerly  ago  

反义参见:

again  

英英释义

副词 once:

on one occasion

同义词：one time, in one case

as soon as

at a previous time;

同义词：formerly, at one time, erstwhile, erst

短语词组

once and for all

1. 永远地; 一次了结地

John's back home once and for all.

约翰回到家, 再也不走了。

once in a while

1. 有时

He went to see them once in a while.

他有时去探望他们。

once more/again

1. 再一次

John's back home once more.

约翰又回家了。

once or twice

1. 几次

I've been there once or twice.

我到过那里几次。

once too often

1. 又一次

He exceeded the speed limit once too often.

他又超速行驶了。

all at once

1. 突然

He left all at once.

他突然离开了。

at once

1. 马上; 立刻

Do it at once!

马上就做!

for once

1. 仅此一次

For once he was telling the truth.

他就这一次说了真话。

补充

onceonce英:[wʌns] 美:[wʌns]adv.1.一次I have been there once.我到过那儿一次。2.曾经, 昔时I once went around the world.过去我周游过全球。conj.1.一旦…就…Once you begin, you must continue.一旦开了头, 你就应当继续下去。n.1.〈口〉一次, 一回She's only done it the once, so don't be too angry.她只做过这一次, 不要太生气。

例句

1. I met her once, briefly.我曾经和她有过短短的一面之缘。 2. I've been to France once before.我以前曾经去过一次法国。 3. once a week每周一次 4. once a month每月一次 5. once every fortnight每两周一次 6. once every three months每三个月一次 7. Texas was once ruled by Mexico.得克萨斯州曾经归墨西哥管辖。 8. I knew him once.我以前认识他。 9. My memory isn't as good as it once was.我的记忆力不如以前好了。 10. a cousin once removed隔一代的堂亲(或表亲) 11. if you once forget it你一旦忘记它的话 12. once again British justice has appeared to falter.英国司法制度似乎再次显现出颓势。 13. She wanted to see him once more before she died.她想在临死之前再见上他一面。 14. They had to be defeated once and for all.必须彻底击败他们。 15. Every once in a while we go to the cinema.我们偶尔会去看电影。 16. She had been to London once or twice before.她以前去过伦敦一两次。 17. once upon a time there were three princes.很久很久以前, 有三位王子。 18. once upon a time, I wanted to change the world.想当年, 我曾想改变这个世界。 19. once inside her flat, she opened the letter.一回到自己的公寓, 她就拆开了那封信。 20. once you have kids, your priorities change.一旦有了孩子, 你的生活重心就会发生变化。 21. Can I borrow your car?—All right then, just this once.我能借一下你的车吗？——那好吧, 仅此一次。 22. All at once there was someone knocking on the door.忽然有人敲门。 23. I knew at once that something was wrong.我立刻意识到情况不妙。 24. They all arrived at once.他们都是同时到达的。 25. Everybody is talking at once.所有人都同时在说话。 26. It was at once a question and a command.这既是询问, 也是命令。 27. She was able, for once, to relax.只有这一次, 她能够放松一下。 28. once you're finished, go home.干完活儿，你就回家吧。 29. they deliver once a week.他们一星期送一次货。 30. [as noun the once]he'd only met her the once.他只见过她一次。 31. he never once complained.他一次也没抱怨过。 32. if she once got an idea in her head you'd never move it.她只要一有想法，你就休想让她改变主意。 33. Gran had once been a famous singer.奶奶曾是个著名歌唱家。 34. once two is two.二乘以一得二。 35. once the grapes were pressed, the juice was put into barrels.葡萄一被挤压，葡萄汁就被装进桶里。 36. all at once the noise stopped.突然，吵闹声停止了。 37. a lot of beans are ready all at once.同时很多豆子准备好了。 38. I fell asleep at once.我马上就睡着了。 39. computers that can do many things at once.可以同时做很多事的电脑。 40. I hope you'll forgive me this once.我希望你就原谅我这一次。 41. once a whinger, always a whinger.曾经是把短刀，始终是把短刀。 42. side two contains four once and future hit singles.第二面有四首持续走红的单曲。 43. once upon a time she would have been jealous, but no longer.她曾经嫉妒心很强，不过现在不了。 44. I've only been to France once.我只去过一次法国。 45. once a week/month/year每周╱月╱年一次 46. I visit them about once every six months.我大约每隔六个月拜访他们一次。 47. This house was once the village school.这幢房子从前是村里的学校。 48. once you've practised a bit you'll find that it's quite easy.稍稍练习之后，你会发觉那是很容易的。 49. People began talking all at once.大家都同时开始说起话来。 50. All at once she got up and left the room.她突然站起来离开了房间。 51. Come here at once!立刻来这里！ 52. I can't understand if you all speak at once.如果你们都同时说起话来，我就听不明白。 53. Just this once, I'll help you with your homework.我来帮你做家庭作业，不过只此一次，下不为例。 54. once again the train was late.火车又一次晚点。 55. Let's listen to that track once more.我们再来听一遍那首歌。 56. You've got to make a decision once and for all.你得作出最后决定。 57. once upon a time there was a beautiful princess...从前有一位美丽的公主… 58. I will repeat the question once.我会重复一次问题。 59. We try to get together (at least) once every month.我们争取每月（至少）聚一次。 60. The play was performed only once.这部剧只演出了一次。 61. He had ridden a horse only once (before).他（以前）只骑过一次马。 62. We go to the movies once or twice a month. [=we go to the movies a few times a month]我们每月去看一两回电影。 63. I've only seen her once or twice. [=I have only seen her a few times]我只见过她一两次。 64. She didn't once thank me.她从未谢过我。 65. He didn't look at me once.他从来没瞧过我一眼。 66. It was once done that way.以前曾经那样做过。 67. A river once flowed through this canyon.过去曾有条河流经这个峡谷。 68. It was once a booming mining town.这里曾经是一座繁荣的矿业镇子。 69. Their music was once very popular.他们的音乐曾经非常流行。 70. a once-successful actor曾红极一时的演员 71. a once-popular restaurant曾一度受欢迎的饭店 72. Let me explain the problem once again.让我再解释一下这个问题。 73. "once again, you've ignored my instructions."你又一次忽视了我的指令。 74. Could I hear the question once more?我能再听一次问题吗？ 75. Let's settle this problem once and for all.我们把这个问题彻底解决了吧。 76. "Winning its fourth straight championship game, the team proved once and for all that they are the best."连续四次赢得比赛冠军，球队彻底证明了自己是最好的。 77. I'm asking you once and for all.我最后问你一遍。 78. "Please, once and for all, stop worrying."最后再说一遍，请别担心了。 79. We spend most of our time at home and go out once in a while.我们大部分时间都待在家里，偶尔出门。 80. "Every once in a while, we have wine with dinner."我们偶尔在晚餐时喝葡萄酒。 81. He was a famous actor once upon a time.他以前是位著名演员。 82. "once upon a time, there was a beautiful princess named Snow White."从前，有一位美丽的公主叫白雪公主。 83. I have tried Indian food more than once.我不止一次品尝过印度美食。 84. Please be on time just this once.就这一次请准时。 85. For once you seem to know what I'm talking about.这次你似乎知道我在说什么。 86. two people talking at once同时说话的两个人 87. The book is at once [=both] funny and sad.这本书既有趣又伤感。 88. She had several projects going on all at once.她同时进行着几个项目。 89. We need to leave at once.我们需要马上离开。 90. You can call the office and get advice at once.你可以给办公室打电话，立刻就能得到建议。 91. "Things got better once he found a job. = once he found a job, things got better."他一找到工作情况就好转了。 92. "once she spoke, I recognized her."她一开口我就认出了她。