音标：[wʌns]
ad. 一次, 曾经, 一旦
conj. 一旦, 一经
n. 一次
a. 从前的
相关词组:
once or twice
not once
all at once
at once
at once...and...
more than once
once more
once and again
once and away
once and for all
once in a way
once in a while
once too often
just for once
once upon a time
once a week
在线英汉词典
once的短语、例句：
once
adv
1 on one occasion only; (for) one time 仅仅一次; （作为）一次
I´ve only been there once. 我只去过那里一次.
He cleans the car once a week, a fortnight, etc, ie every week, every fortnight, etc. 他一星期、 半月等擦一次车.
She goes to see her parents in Wales once every six months. 她每半年回威尔士看父母一次.
2
(a) at some (indefinite) time in the past 一度; 曾经
I once met your mother. 我曾经见过你的母亲.
He once lived in Zambia. 他一度住在赞比亚.
(b) formerly 从前; 过去; 往日
This book was once famous, but nobody reads it today. 这本书从前很出名, 现在没人看了.
3 (in negative sentences or questions 用於否定句或疑问句) ever; at all; even for one time 根本; 即使一次
He never once/He didn´t once offer to help. 他从未[根本没]主动提出帮忙.
Did she once show any sympathy? 她表示过同情吗?
4 (idm 习语) ,all at `once suddenly 突然
All at once the door opened. 门突然打开了.
All at once she lost her temper. 她突然大发雷霆. at `once
(a) immediately; without delay 立刻; 马上; 立即
Come here at once! 立刻到这里来!
I´m leaving for Rome almost at once. 我马上就要去罗马.
(b) at the same time 同时
Don´t all speak at once! 不要大家一齐说!
I can´t do two things at once. 我无法同时做两件事.
The film is at once humorous and moving. 这部电影既幽默又动人. (just) for `once; just this `once on this occasion only, as an exception 仅此一次; 作为例外
Just for once he arrived on time. 只有这次他是按时到了.
Be pleasant to each other just this once. 彼此要和睦些--就只为这一次吧. get/give sb/sth the `once-over (infml 口) get/give sb/sth a quick inspection or examination 粗略检查或察看某人[某事物]
Before buying the car he gave it the once-over. 他买那辆车前曾草草看了一下.
She felt his parents were giving her the once-over. 她感到他父母打量著她. once `again; once `more one more time as before 再一次
I´ll tell you how to do it once again. 我再告诉你一次怎麽做.
Amanda is home from college once again. 阿曼达又从学校回到家中. ,once and for `all now and for the last (and only) time 这一次且为最後一次
I´m warning you once and for all. 我给你最後一次警告.
He´s travelled a lot but he´s now come back to Britain once and for all. 他游历了许多地方, 现在落叶归根又回到了英国. ,once `bitten, ,twice `shy (saying 谚) after an unpleasant experience one is careful to avoid sth similar 一次被咬, 下次胆小; 一次上当, 下次小心
She certainly won´t marry again once bitten, twice shy. 她肯定不再结婚了--所谓一朝被蛇咬, 十年怕井绳. ,once in a blue `moon (infml 口) very rarely or never 极少; 从不
I see her once in a blue moon. 我难得看到她. (every) ,once in a `while occasionally 偶尔; 间或
Once in a while we go to a restaurant but usually we eat at home. 我们偶尔下馆子--但一般都在家吃. once `more
(a) one more time; again 再一次; 又一次
Let´s sing it once more. 咱们再唱一次吧.
(b) = once again. ,once or `twice a few times 一两次
I don´t know the place well, I´ve only been there once or twice. 我对那地方不大熟悉, 只去过一两次. ,once too `often once more than is sensible or safe 这一次却未能幸免
He had driven home drunk once too often -- this time he got stopped by the police. 他多次醉酒开车回家, 上得山多终遇虎--这回让警察截住了. ,once upon a `time (used as the beginning of a fairy-tale 用於童话开头) at some indefinite time in the past 从前; 古时候
Once upon a time there was a beautiful princess... 从前有个美丽的公主.... you´re only young once => only2. once, conj as soon as; when 一旦; 一...就...
Once you understand this rule, you´ll have no further difficulty. 一旦明白了这条规则, 就再也没有困难了.
How would we cope once the money had gone? 钱一用完, 我们怎麽办?
once