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IELTS BNC: 548 COCA: 300
once
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adverb, conjunction, noun /wʌns/
Once can be used in the following ways: once 有以下用法
as an adverb: 用作副词: I only met him once. 我只见过他一次。 They've been here once before. 他们以前来过这儿一次。
as a conjunction: 用作连词: Once you get there, you'll love it. 只要你到了那儿，你就会喜欢它的。
as a noun (after ‘for' or ‘at'): 用作名词（用于for或at后）: For once I wish you'd tell me the truth. 我就这一次希望你能告诉我实话。 (after ‘the', ‘this', or ‘that'): 用于the，this 或that 后: Yes, I met him, but just the once. 是的，我见过他，不过就那一次。
  1. 1
    on one occasion only 一次；一回

    Cathy's only been to visit us once. 凯茜只来看过我们一次。

    I'd seen the show once before, but I enjoyed seeing it again. 这个表演我过去看过一次，不过我喜欢再看一遍。

    I'm only going to say this once, so listen carefully. 这个我只讲一次，所以请认真听。

    (just) the once (=on one particular occasion only) 只有一次 :

    We met just the once, but I still remember him very clearly. 我们就见那一次，但我仍然很清楚地记得他。

     Synonyms and related words
    Happening only once: once, isolated, unrepeatable...
  2. 2
    used for saying that a particular situation existed at a time in the past, but it does not exist any longer 曾经；一度

    Did you know that Dan was once a policeman? 你知道丹曾经当过警察吗？

    Louise bought the house where her grandparents had once lived. 路易丝买下了他祖父母曾经住过的房子。

    The once mighty US car industry was now facing strong competition from abroad. 一度强大的美国汽车工业现正面临着来自国外的有力竞争。

     Synonyms and related words
    Existing, happening in or relating to a time in the past: past, ago, previously...
    1. a.
      used for saying that something happened at some time in the past 有一次

      Once we drove all the way to Edinburgh with four little kids in the back seat. 有一次，我们让4个孩子坐在后座，一路开车去爱丁堡。

      I once taught myself to knit, and I was pretty good at it. 我曾自学编织，织得非常好。

       Synonyms and related words
      Existing, happening in or relating to a time in the past: past, ago, previously...
  3. 3
    used for saying that as soon as one thing happens, something else happens 一…就…

    Once we were through the gates, she went off and left me on my own. 我们一过了大门，她就走掉了，只剩我自己一个人。

    I'm sure you'll be very happy here once you get to know everyone. 我敢肯定一旦你认识了所有人，你在这儿就会很愉快。

     Synonyms and related words
    After another event or time: after, following, since...
See also
once
adverb
  1. From our crowdsourced Open Dictionary
    once something, always something used to say that a person cannot change their fundamental nature

    As Rebecca puts it, once a cheater, always a cheater.

    Submitted by Boris Marchenko from Russian Federation on 12/07/2017
     

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