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BNC: 470 COCA: 547
half
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adjective, adverb, noun, number, predeterminer, pronoun /hɑːf/
singularhalf
pluralhalves
Half can be used in the following ways: half 有以下用法
as a predeterminer (followed by a word such as ‘a', ‘the', ‘this', or ‘his'): 用作前置限定词（后接a, the, this或his 之类的词）: We live half a mile up the road. 我们住的地方沿这条路要走半英里。 I have to spend half my time looking after the children. 我得花一半的时间照料这些孩子。
as a pronoun: 用作代词: Let's share the prize money. You can have half. 我们来分奖金吧。你可以得一半。 (followed by ‘of'): 后接of: 48 is half of 96. 48是96的一半。 Half of us are still unemployed. 我们这些人中有半数仍然失业。 (following ‘in' or ‘by'): 跟在in 或 by 后: Cut the apple in half. 把苹果切成两半。 The crime rate has been reduced by half. 犯罪率下降了一半。
as an adjective (followed by a noun): 用作形容词（后接名词）: We ordered a half bottle of red wine. 我们要了半瓶红酒。 They sold 250 tickets in the first half hour. 他们在头半小时里售出了250张票。
as an adverb (followed by an adjective, adverb, or preposition): 用作副词（后接形容词、副词或介词）: I was only half awake. 我刚醒了一半。 She spoke half in Italian and half in English. 她讲的话一半是意大利语，一半是英语。 (followed by a verb or participle): 后接动词或分词: I only half understood what she was saying. 当时她说的话我只听懂了一半。 a half finished building 完工一半的楼房 (followed by ‘as'): 后接as: A nurse only earns half as much as a doctor. 护士挣的钱只有医生的一半。
as a countable noun: 用作可数名词: The group was divided into two halves. 这一组被一分为二。 Our team scored two goals in the second half. 我们队在下半场进了两个球。
as a number: 用作数词: Emma was talking well by the age of two and a half. 埃玛两岁半的时候说话就很流利了。
  1. 1
    ½ or 50%
    1. a.
      used for referring to one of two equal parts into which an amount, group, or object can be divided 一半；一半的

      The rebel army now controls over half the country. 目前叛军控制了超过一半的国土。

      The students spend half their time on practical work. 学生们把一半的时间花在实践工作上。

      half of :

      Prices rose by over 15% during the second half of 1988. 1988年的下半年物价上涨超过15％。

      Would anyone like the other half of my pizza? 我的比萨饼的另一半有人要吗？

      When we interviewed employees, nearly half of them complained of stress. 我们与雇员面谈时，有将近一半的人抱怨压力大。

      divide/cut/split etc something in half :

      Peel the potatoes and cut them in half. 把马铃薯去皮，然后对半切。

       Synonyms and related words
      Fractions and types of fraction: and, billionth, common denominator...
    2. b.
      used in numbers, measurements, and ages to mean ½ （用在数字、尺寸、年龄中）半

      One and a half million people have been driven from their homes. 150万人已经被赶出家园。

      Jasmine started school when she was four and a half. 贾斯敏4岁半时开始上学。

      half an hour/a mile etc :

      We had to wait half an hour for a bus. 我们只好等了半小时公共汽车。

      half hour/mile etc :

      She walked the half mile from Fleet Street back to her office. 她从舰队街步行半英里回到了自己的办公室。

      half a dozen/a half dozen (=six) 半打 :

      half a dozen eggs 半打鸡蛋

       Synonyms and related words
      Fractions and types of fraction: and, billionth, common denominator...
    3. c.
      used for saying that someone or something is made up of 50% of one thing and 50% of something else 一半…，一半…
      half something (and) half something :

      The fabric is half nylon, half cotton. 这种面料里尼龙和棉各占一半。

      Marie is half Vietnamese, half French (=one of her parents is from Vietnam, the other is from France). 玛丽有一半越南血统，一半法国血统。

      The fearsome creature was half man and half beast. 这可怕的怪物是半人半兽。

      half and half (=50% of each) 相等的；对等的 :

      There used to be a lot more men than women in the medical school, but now it's about half and half. 过去医学院里男生比女生多得多，但现在男女生数量基本相等。

       Synonyms and related words
      Fractions and types of fraction: and, billionth, common denominator...
  2. 2
    used for saying that something happens partly but not completely, or that something is partly in a particular state 部分地；在某种程度上

    Through the half open door I could hear the sound of Alan's voice. 从半开着的门里我可以听到艾伦的声音。

    The rocks were half under water. 礁石的一部分在水下。

    I only half understood the instructions. 我只了解一半的说明。

    half-empty/half-full :

    a half-empty milk bottle 半空的牛奶瓶

     Synonyms and related words
    Slightly, to some degree and not completely: slightly, fairly, partly...
  3. 3
    used for emphasizing how bad or extreme a situation is （用于强调情况极糟或极严重）

    Your mother's been going half crazy worrying about you. 你母亲都快为你急疯了。

    I seem to spend half my life cleaning up after those kids. 我似乎花了大半辈子时间跟在这些孩子身后收拾整理。

     Synonyms and related words
    Ways of emphasizing how bad something is: utterly, sadly, hopelessly...
  4. 4
    one of the two equal periods of time into which a game of football, basketball, hockey etc is divided (足球赛、篮球赛、曲棍球赛等的)半场，半局

    Neither team scored in the first half. 前半场两队均无得分。

     Synonyms and related words
    Specific periods of time in a game or match: break, extra time, first half...
  5. 5
    British mainly spoken half a pint of a drink, especially beer 半品脱（啤酒）

    A pint of lager and a half of Guinness, please. 请来一品脱淡啤酒，半品脱吉尼斯黑啤酒。

     Synonyms and related words
    Types and amounts of alcoholic drinks: alcohol, alcopop, aperitif...
  6. 6
    British a ticket for a child or an old person, that only costs half the price that an adult usually pays 半（价）票

    Two and two halves to London Bridge, please. 买去伦敦桥的两张全票和两张半票。

     Synonyms and related words
    Tickets for travelling: Apex, boarding card, boarding pass...
  7. 7
    British one of the two equal areas of the field that are defended by either team in a game such as football （球赛场地的）半场
     Synonyms and related words
    Sports fields and parts of sports fields: all-seater, the area, AstroTurf...
See also
Get It Right!: half
Don't use a or the before half or half of:
✗ Nearly a half of the programmes included advertising.
✓ Nearly half of the programmes included advertising.
✗ Girls constitute the half of the population of universities.
✓ Girls constitute half of the population of universities.
You can use the definite article ( the) before half with an adjective such as first, second, or next when you are referring to something that has been mentioned before:
The second half of the film is not as good as the first.
The movement gathered impetus during the next half century.
When half forms part of a number, the most common structure is one and a half, two and a half, three and a half etc.
✗ Tourists can visit any of these sites within one and half hours.
✓ Tourists can visit any of these sites within one and a half hours.
✗ They made us wait for two hours and a half for our visa.
✓ They made us wait two and a half hours for our visa.
Always use a plural noun in this structure:
✗ A 90-minute film might last two and a half hour with commercials.
✓ A 90-minute film might last two and a half hours with commercials.

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