新东方-柯林斯雅思备考词典

once

英 [wʌns]

[ADV, CONJ, PRON]

词汇频率：

ADV. 副词

1. 一次
If something happens once, it happens one time only.
双语例句
例：
I met Miquela once, briefly.
我匆忙见过蜜凯拉一次，时间很短。
例：
Since that evening I haven't once slept through the night.
从那天晚上之后，我再也没睡过一次囫囵觉。
2. 每隔…一次
You use once with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month.
双语例句
例：
Lung cells die and are replaced about once a week.
肺细胞约每周死亡、更新一次。
3. 从前
If something was once true, it was true at some time in the past, but is no longer true.
双语例句
例：
Her parents once ran a shop.
她父母从前开过一家商店。
例：
I lived there once myself, before I got married.
结婚前，我曾独自在那儿住过。
4. 曾经
If someone once did something, they did it at some time in the past.
双语例句
例：
I once went camping at Lake Michigan with a friend.
我曾和一个朋友去密执安湖野营。
例：
We once walked across the frozen pond at two in the morning.
我们曾在凌晨两点徒步横穿冰冻的池塘。

CONJ. 连词

1. 一…就
If something happens once another thing has happened, it happens immediately afterwards.
双语例句
例：
The decision had taken about 10 seconds once he'd read a market research study.
他读完一份市场调研报告后，大概10秒就做出了决定。

PHRASE. 习语

once again , once more
1. 再一次
If something happens once again or once more, it happens again.
双语例句
例：
Amy picked up the hairbrush and brushed her hair once more.
艾米拿起梳子，又梳了一遍头发。
once and for all
1. 最终地
If something happens once and for all, it happens completely or finally.
双语例句
例：
We have to resolve this matter once and for all.
我们必须彻底解决这件事情。
once in a while
1. 偶尔
If something happens once in a while, it happens sometimes, but not very often.
双语例句
例：
Your body, like any other machine, needs a full service once in a while.
和其他机器一样，你的身体偶尔也需要一次全面保养。
once or twice
1. 一两次 , 几次
If you have done something once or twice, you have done it a few times, but not very often.
双语例句
例：
I visited once or twice.
我参观过一两次。
例：
Once or twice she had caught a flash of interest in William's eyes.
有一两次，她看到威廉的眼睛里流露出一丝感兴趣的神色。
all at once
1. 突然
If something happens all at once, it happens suddenly, often when you are not expecting it to happen.
双语例句
例：
All at once there was someone knocking on the door.
突然有人敲门。
at once
1. 立刻
If you do something at once, you do it immediately.
近义词
immediately
双语例句
例：
I have to go at once.
我得马上走。
例：
Remove from the heat, add the parsley, toss and serve at once.
从火上端下来，加入香芹，搅拌后立刻上桌。
at once , all at once
1. 同时
If a number of different things happen at once or all at once, they all happen at the same time.
双语例句
例：
You can't be doing two things at once.
你不能一心二用。
for once
1. 就此一次
For once is used to emphasize that something happens on this particular occasion, that it has never happened before, and may never happen again.
双语例句
例：
For once, Dad is not complaining.
这一次爸爸居然没有抱怨。

PRON. 代词

1. 一次
If something happens the once it happens one time only.
双语例句
例：
'Have they been to visit you yet?'—'Just the once, yeah.'
“他们去看过你了吗？” “来过，就那一次。”