| 单词 | a |
| 释义 | ☞ uncountable nounsa/ə;strong form eɪ ; ə; e/(also an /ən ;strong form æn ; ən; æn/) indefinite article ☞the form an is used before a vowel sound. 元音前用an。 1. one 一（个）: ◇a cup of coffee, please. 请给我一杯咖啡。◇we've got an apple, a banana and two oranges. 我们有一个苹果、一根香蕉和两个橘子。 2. used when you talk about one example of sth for the first time （用于首次提及的事物）: ◇i saw a dog chasing a cat this morning. the cat climbed up a tree. 今天早上我看见狗在追猫。那只猫爬了上树。◇have you got a dictionary (= any dictionary)? 你有词典吗？ 3. used for saying what kind of person or thing sb/sth is （用以表达何种人或物）: ◇he's a doctor. 他是医生。◇she's a muslim. 她是穆斯林。◇you are a clever boy. 你是个聪明的孩子。◇‘is that an eagle?’‘no, it's a falcon.’ “那是鹰吗？”“不，是隼。” 4. (used with prices, rates, measurements) each （与价格、比率、度量衡单位连用）每，每个: ◇i usually drink two litres of water a day. 我一天通常喝两升水。◇twice a week 一星期两次◇he was travelling at about 80 miles an hour. 他当时正以每小时约80英里的速度行进。 5. used with some expressions of quantity （与某些表示数量的词连用）: ◇a lot of money 很多钱◇a few cars 几辆汽车 6. used when you are talking about a typical example of sth （用以指某物的典型例子）: ◇an elephant can live for up to eighty years. 大象可以活到八十岁。 you can also use the plural in this sense elephants can live for up to eighty years. 这个意义也可用复数：elephants can live for up to eighty years. for more information about the indefinite article, look at the quick grammar reference section at the back of this dictionary. 有关不定冠词的详细用法，参看本词典末“语法便览”部份。 a-/eɪ ||; e/prefix (in nouns, adjectives and adverbs 用于构成名词、形容词及副词) not; without 非；没有: ◇atheist 无神论者◇amoral 不遵循道德规范的 a /ə; ə; strong 强读 e; eɪ/ also 又作 an (before a vowel sound 用于母音前)determiner 1. used before a noun to show that you are talking about a general type of thing, not a specific thing ［用于名词前泛指一类事物，而非特指］:◇do you have a car? 你有汽车吗？◇her boyfriend is an artist. 她的男朋友是位艺术家。→ compare 比较 the 2. one 一（个）:◇a thousand pounds 一千英镑◇a dozen eggs 一打鸡蛋 3. used in some phrases that say how much of something there is ［用于某些表示数量的片语中］:◇a few weeks from now 从现在算起的几个星期◇a lot of people 许多人 4. every or each 每一:◇a square has 4 sides. 正方形有四条边。◇once a week/$100 a day etc (=one time each week, $100 each day etc) 每周一次/每天 100 元等: he gets paid $100,000 a year. 他一年可赚十万元。 5. used before two nouns that are frequently mentioned together ［用于常被一起提及的两个名词前］:◇a knife and fork 一副刀叉 6. used before some singular nouns that are actions ［用于某些表示动作的单数名词前］:◇have a look at this. 看看这个。usage note 用法说明: a or 或 anyou use an before a word that starts with a vowel sound. 在以母音开头的单词前用 an:◇an apple 一个苹果◇an hour 一小时◇an mba 一名工商管理学硕士。use a for words that do not begin with a vowel sound. 在不以母音开头的单词前用 a:◇a house 一幢房子◇a useful tool 一件有用的工具◇a cd player 一台雷射唱片机。note that you make this choice according to what the words sound like, not whether the first letter actually is a vowel or not. for example although the letter 'h' in 'hour' is not a vowel, an is used because it is pronounced like a vowel in this word. 注意选择应根据单词发音，而非首字母是否母音。例如虽然 hour 中的字母 h 不是母音，但因为它在单词中发音是母音所以用 an。 a- /e, æ, ə; eɪ, æ, ə/prefixused at the beginning of some words to mean 'not' 非［用于某些单词的开头］:◇atypical 不［非］典型的◇amoral 非道德的; 没有是非观念的 ☞ a☞ a, a☞ a, a |
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