Learner's definition of ONCE
1
: one time only一次 -
I will repeat the question once.我会重复一次问题。
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We try to get together (at least) once every month.我们争取每月（至少）聚一次。
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The play was performed only once.这部剧只演出了一次。
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He had ridden a horse only once (before).他（以前）只骑过一次马。
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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。
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I've only seen her once or twice. [=I have only seen her a few times]我只见过她一两次。
2
: at any one time : ever任何一次；从来 3
: at some time in the past过去；曾经 -
It was once done that way.以前曾经那样做过。
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A river once flowed through this canyon.过去曾有条河流经这个峡谷。
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It was once a booming mining town.这里曾经是一座繁荣的矿业镇子。
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Their music was once very popular.他们的音乐曾经非常流行。
—
sometimes used in combination有时用于合成词
once again/more
: for another time : one more time : again再一次 -
Let me explain the problem once again.让我再解释一下这个问题。
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Once again, you've ignored my instructions.你又一次忽视了我的指令。
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Could I hear the question once more?我能再听一次问题吗？
once and for all
: now and for the last time最后地；彻底地 -
Let's settle this problem once and for all.我们把这个问题彻底解决了吧。
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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。
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I'm asking you once and for all.我最后问你一遍。
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Please, once and for all, stop worrying.最后再说一遍，请别担心了。
once bitten, twice shy
— see 1bite
once in a while
: sometimes but not often : occasionally偶尔地；间或 -
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。
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Every once in a while, we have wine with dinner.我们偶尔在晚餐时喝葡萄酒。
once upon a time
: at some time in the past从前；过去 ◊ Once upon a time is the traditional way to begin a fairy tale.“从前…”是童话故事传统的开篇语。
2 once /ˈwʌns/ noun
Learner's definition of ONCE
[noncount]
: one single time一次 -
I have tried Indian food more than once.我不止一次品尝过印度美食。
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Please be on time just this once.就这一次请准时。
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For once you seem to know what I'm talking about.这次你似乎知道我在说什么。
at once
1
: at the same time同时 -
two people talking at once同时说话的两个人
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The book is at once [=both] funny and sad.这本书既有趣又伤感。
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She had several projects going on all at once.她同时进行着几个项目。
3 once /ˈwʌns/ conjunction
3 once
/ˈwʌns/
conjunction
Learner's definition of ONCE
: at the moment when : as soon as…就 -
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。
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Once she spoke, I recognized her.她一开口我就认出了她。