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IELTS BNC: 46 COCA: 51
one
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determiner, number, pronoun /wʌn/
One can be used in the following ways: one 有以下用法
as a number: 用作数词: We have only one child. 我们只有一个孩子。 How much does one pound of apples cost? 一磅苹果多少钱？
as a determiner: 用作限定词: He grew roses on one side of his garden, and vegetables on the other. 他在园子的这一边种玫瑰，那一边种菜。 We'll meet again one day. 我们总有一天会再见面。
as a pronoun (the plural of this pronoun is ones and the possessive is one's): 用作代词（其复数形式是ones， 所有格形式是one’s）: It's a good book, but his last one was better. 这是一本好书，但他的上一本更好。 One has to trust one's family. 一个人得相信他的家人。 They are the ones who suffered. 遭殃的是他们。 (followed by ‘of'): 后接of: Sydney is one of the world's most exciting cities. 悉尼是世界上最激动人心的城市之一。
  1. 1
    the number 1 （数字）一

    I've only got one hour free. 我只有1个小时有空。

    They have one daughter and five sons. 他们有1个女儿，5个儿子。

    Over one hundred people were killed in the disaster. 100多人死于这次灾难。

    It was a one-storey building with big windows. 这是一座有大窗户的平房。

     Synonyms and related words
    Cardinal numbers: billion, cardinal number, crore...
  2. 2
    used for referring to a single person or thing when there are others of the same type （同一群人或同一组物中的）一个

    I bought three T-shirts – do you want one? 我买了3件T恤衫，你要一件吗？

    One passenger said she had been waiting for 13 hours. 一位乘客说她已经等了13个小时。

    I heard of one case where a 12-year-old boy had been sent to prison. 我听说过一个案件，案中一个12岁的男孩被关进了监狱。

    one of :

    Ours was one of the top four boats in the competition. 我们的船是这次竞赛中最棒的4艘之一。

    One of the buildings was badly damaged in the fire. 其中一座建筑物在大火中遭到严重毁坏。

    I met one of her brothers when he was here on business. 我见过她的一个兄弟，当时他正在此地出差。

    just the one :

    ‘How many books did she borrow?' ‘Just the one.' “她借了几本书？”“就这一本。”

  3. 3
    used for referring to something when that type of thing has already been mentioned or when it is obvious what type of thing you are talking about （用于表示提及的或显然正在谈到的那类事物）

    It was a problem, but not a major one. 这是个问题，但不是主要问题。

    I'm only using this radio until I can buy a better one. 我现在只是暂时用这台收音机，直到我能买一台更好的。

    Your experiences are ones that are shared by countless other parents. 你的经历是无数父母都有过的经历。

    the one/ones :

    I'm going to keep those boxes. The ones I want to get rid of are in the garage. 那些箱子我要留着，不要的那些在车库里。

    this one/that one/these ones/those ones :

    I'd never seen a game like that one. 我从来没见过像那场一样的比赛。

    1. a.
      used for referring to a particular joke, comment, idea, or question （用于指笑话、评论、主意或问题）

      You want me to say how much freedom students should have? That's a tricky one. 你要我说学生应有多大的自由？那是个很难回答的问题。

      the one about (=the joke about someone or something) 关于…的笑话 :

      Did you hear the one about the American who goes into a bar in Paris? 你听说过那个关于进巴黎酒吧的美国人的笑话吗？

  4. 4
    used for referring to someone when they have been mentioned before or when it is obvious which person you are talking about （用于表示提过或显然正在谈到的人）
    the one/ones :

    David and I are the only ones left who are not married. 剩下的人中只有我和戴维两个是单身汉。

    They were all dealing drugs, but Bob was the one who got caught. 他们全都在贩卖毒品，但鲍勃却是被抓住的那一个。

    Who is the one with the beard? 留胡须的那个人是谁？

    1. a.
      people of a particular type （某一类）人
      the young/clever/lucky etc ones :

      The clever ones always come out on top. 聪明的人总是会成为佼佼者。

    2. b.
      formal used instead of ‘someone' 某人

      I speak as one who has seen much suffering. 我是作为一个目睹过许多苦难的人说这番话的。

  5. 5
    formal used instead of ‘you' when you are making a statement about people in general, which also applies to yourself （总称）任何人

    Why, one may ask, would someone want to burn down their own house? 可能有人会问，为什么有些人想要烧掉自己的房子？

    One cannot always be right, can one? 谁都不会永远是正确的，对吗？

    One must bring one's own talents to every single task. 一个人应该在每一项任务中发挥自己的才能。

    One cannot be sure what lies ahead. 谁都无法肯定将来会发生什么事。

  6. 6
    the only person or thing of a particular type 唯一的
    the one :

    She found herself in the one spot that gave her no shelter from the rain. 她发现自己处在唯一一处不能避雨的地方。

    We're going to have to play the one team we did not want to play. 我们将不得不与我们唯一不想与之对阵的队进行比赛。

    1. a.
      used for emphasizing that something is someone's only hope, disappointment, fear etc 唯一的（用于强调希望、失望、恐惧等）
      the one :

      The one disappointment we had was that we didn't get to shake hands with the President. 我们唯一失望的是没能跟总统握手。

      someone's one hope/fear/concern etc :

      My one hope is that more people with disabilities will enter into professions like social work. 我唯一的希望是更多的残疾人士能加入到社会福利等工作中去。

  7. 7
    used for emphasizing a particular fact, person, or thing （用于强调某一事实、某个人或事物）

    There's one thing you can be sure of – you won't get any help from the government. 有件事你可以肯定，你从政府那儿得不到任何帮助。

    One person who won't be invited is that awful man who lives downstairs. 一个不会被邀请的人就是住在楼下的那个极讨厌的家伙。

    1. a.
      mainly American informal used for emphasizing that someone or something is a particular type of person or thing 一个确实…的，一个非常…的（用于强调某类人或事物中的一个）

      He's one proud man, I'll tell you. 我要告诉你，他是个非常骄傲的人。

  8. 8
    used for mentioning the first of two or more similar people or things, especially when you are comparing them （用于提及两个或多个相似的人或东西中的第一个，尤指用于比较时）
    one... the other :

    She lay on the sofa with a glass in one hand and an empty bottle in the other. 她躺在沙发上，一只手拿着酒杯，另一只手拿着一个空酒瓶。

    If you love both children, I don't understand why you give so much to one and not the other. 如果你两个孩子都爱，我搞不懂为什么你对一个付出那么多而对另一个却不是如此。

    one... another :

    He could not tell the difference between one flower and another. 他无法区分花与花之间的差别。

  9. 9
    formal used before someone's name when you do not know them or have not met them before 某个叫…的人（用于不认识或没见过的人的名字前）

    I borrowed the money from one Edward Ashley. 我从一个叫爱德华·阿什利的人那儿借到这些钱。

  10. 10
    informal a glass of alcoholic drink 一杯酒

    Have you got time for a quick one before you go? 你走之前有时间喝上一杯吗？

     Synonyms and related words
    Types and amounts of alcoholic drinks: alcohol, alcopop, aperitif...
    See also road
one
number
  1. From our crowdsourced Open Dictionary
    1
    one and done a parent or parents of one child, who have decided they do not want to have any more children

    After the birth of their son, John and Sarah were totally one and done.

    Submitted on 26/11/2018
     
  2. From our crowdsourced Open Dictionary
    2
    do one very informal to go away 滚开；滚蛋

    I told him to do one.

    Submitted from United Kingdom on 21/03/2019
     
one
pronoun
  1. From our crowdsourced Open Dictionary
    be all one to someone to make no difference at all to someone

    My girlfriend is not car-savvy as all car brands are all one to her.

    Submitted by Boris Marchenko from Russian Federation on 02/07/2017
     

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