once

英 [wʌns] 美 [wʌns]

• adv. 一次；曾经
• conj. 一旦
• n. 一次
• adj. 曾经的

双解释义

adv. (副词)

1. 一次

   one time

2. 曾经,昔时

   at some time in the past

conj. (连词)

1. 一旦…就

   …if ever

2. 只要…就

   …as soon as

n. (名词)

1. [S]一次,一回

   the one time

详尽释义

adv. 副词

1. 一次，一回
2. 曾，曾经，从前，昔日
3. 同时
4. 根本
5. 突然，骤然，忽然
6. 一旦
7. 立即，马上
8. 仅此一次（与通常情况对比而言）
9. 最终地

conj. 连词

1. 一…就 ，一旦…就… ，一经...便
2. 当…时候，每当

n. 名词

1. 一次，一回，一度

adj. 形容词

1. 从前的，以前的，曾经的
2. 一度的

英英释义

Adverb:

1. on one occasion;

   "once I ran into her"
   

2. as soon as;

   "once we are home, we can rest"
   

3. at a previous time;

   "at one time he loved her"
   "her erstwhile writing"
   "she was a dancer once"
   

例句

用作副词 (adv.)

1. Once or twice she looked over her shoulder at me.
   有一两次她回头看看我。
2. She had not once spoken to him all the evening.
   整整一晚上,她都没有跟他讲过一次话。
3. I see them about once a fortnight.
   我大约两星期见他们一次。
4. Once we lived in London.
   我们曾经住在伦敦。

常见句型

用作副词 (adv.)

1. I have been there once.
   我到过那儿一次。
2. I once went around the world.
   过去我周游过全球。

用作连词 (conj.)

1. Once you begin, you must continue.
   一旦开了头,你就必须继续下去。
2. Once you have taken the examination, you'll be able to relax.
   你一旦考过试,就可以轻松一下了。
3. Once you have promised you must do it.
   你既已答应,就应该去做。
4. Once inside her bedroom, she began to cry.
   一走进卧室,她就哭了。

用作名词 (n.)

1. Once is enough for me.
   我一次就够了。
2. She's only done it the once so don't be too angry.
   她只做过这一次,所以不要太生气。

经典引文

• Miss Trant read it through once.sssss S. Bedford

  出自： ssssJ. B. Priestley

常用短语

用作副词 (adv.)

once again

一而再,再来一次now again, as in the past

once and for all

一次了结地,一劳永逸地for the last time

once in a while

有时,偶尔sometimes, but not often

once more

再一次now again as before

once or twice

几次several times; a few times

once upon a time

从前some time ago; formerly

用作名词 (n.)

all at once

同时at the same time

at once

立刻immediately

词汇搭配

• once in a blue moon 罕见的，极少的，难得...
• at once 立刻
• once or twice 一两次
• all at once 同时
• once and for all 彻底地
• once upon a time 从前
• once bitten, twice shy 一朝被蛇咬,十年怕井...
• once more 再一次
• once again 再一次
• once too often 又一次
• once in a while 偶尔
• once and away 一次了解地
• not once 一次也不
• more than once 不止一次(好几次)...
• once and again 一而再
• gone 过去的
• for once 就这一次
• every once in a while 间或
• once in a way 有时(偶而
• for this once 就这一次

词语用法

conj. (连词)

1. once用作连词时可引导时间状语从句和条件状语从句。用于前者时意为“一旦…就…”,所引导的从句多很短; 用于后者时意为“只要”,这种条件从句似带有时间条件的含意。
2. once引导的从句中有些部分可以省略。

词义辨析

n. (名词)

at once, directly, immediately, instantly, presently, right away

• 这组词(组)的共同意思是“立即”“马上”。其区别在于:
• 1.at once主要指动作迅速,但中间多有一段距离,且at once比immediately意味更强。例如:
• I'm leaving for Rome at once.我马上去罗马。
• He gave orders for the work to be started at once.他下令立即开始那项工作。
• 2.immediately侧重指时间“紧接着”。例如:
• I came immediately after I'd eaten.吃过饭我立即就来了。
• Please close your books immediately and answer these questions.请立即合上书,回答这些问题。
• I left immediately when the clock struck twelve.钟刚打12点我就离去了。
• 3.right away经常出现在美式英语中。例如:
• I'll do it right away.我立即去办。
• He had written down a list of things to do right away.他已写下须立即做的事情。
• Don't expect them to approve of the design right away.不能期望他们马上批准这项设计。
• 4.instantly也是指动作迅速,但它更强调的是同时发生,中间有很短的距离或无距离。例如:
• The electrician went instantly in answer to the phone call.电工师傅一接到电话马上就去了。
• He was killed instantly in a car accident.在车祸中,他当场死亡。
• 5.directly强调“直接地”,多与“迂回绕过”相对。例如:
• Whether he sailed directly across the bay or coasted round it is uncertain.他是径直驶过海湾,还是沿海岸迂回绕过的,现在还无法确知。
• 6.presently强调过一会再去做某事。例如:
• I will do the dishes presently, but I want to finish the story first.我过一会去洗碟子,不过我想得先看完这篇故事。

at once, soon

• 这两个词(组)的区别是:soon表示“不久”“很快”,强调时间很短; at once表示“马上”“立刻”,强调动作随即发生。例如:
• He soon became active in the class.他在班上很快就变得活跃起来。
• When I heard the knock,I opened the door of the room at once.我听到敲门声马上就把房门打开了。

once，as soon as

• 两者均为从属连词，引导时间状语从句，都表示主句的动作紧跟在从句的动作之后发生。
• once除表时间外，还表示条件，一般译作“一旦......就......”。
• as soon as强调的只是时间，译作“刚......就......”或“一......就......”。

词源解说

• ☆ 直接源自古英语的ane，意为一。

近反义词

【近义词】

• at one time