A or an is the indefinite article. It is used at the beginning of noun groups which refer to only one person or thing. The form an is used in front of words that begin with vowel sounds.
a 或 an 为不定冠词，用于表示单个事物或人的名词词组之前。an 用于以元音开始的单词之前。
1 DET （指初次提及或非特指的人或物）一（个） You use a or an when you are referring to someone or something for the first time or when people may not know which particular person or thing you are talking about. （指初次提及或非特指的人或物）一（个）
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A waiter entered with a tray.
侍者端着托盘进来了。
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He started eating an apple.
他开始吃苹果。
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Today you've got a new teacher taking you.
今天有位新老师来教你们。
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I manage a hotel.
我经营一家旅馆。
2 DET （一类人或事物中非特指的）任何一（个） You use a or an when you are referring to any person or thing of a particular type and do not want to be specific. （一类人或事物中非特指的）任何一（个）
3 DET （用于前加形容词或后加修饰语的不可数名词之前）一（种） You use a or an in front of an uncount noun when that noun follows an adjective, or when the noun is followed by words that describe it more fully. （用于前加形容词或后加修饰语的不可数名词之前）一（种）
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There was a terrible sadness in her eyes.
她眼神中流露出深深的悲伤。
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He did have a real knowledge of the country.
他对该国的确知之甚多。
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Baseball movies have gained an appreciation that far outstrips those dealing with any other sport.
以棒球为主题的电影获得的青睐远远超过了其他体育类电影。
4 DET （用于物质名词前）一（类），一（种） You use a or an in front of a mass noun when you want to refer to a single type or make of something. （用于物质名词前）一（类），一（种）
5 DET （用于表示数量的词组中）许多/少许/一点 You use a in quantifiers such as a lot ,a little, and a bit. （用于表示数量的词组中）许多/少许/一点
6 DET （一类人或事物中典型的）一（个） You use a or an to refer to someone or something as a typical member of a group, class, or type. （一类人或事物中典型的）一（个）
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Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。
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...the operation a patient has had.
病人做过的手术
7 DET （用于日子、月份或节日的名称之前以表示特例）一个 You use a or an in front of the names of days, months, or festivals when you are referring to one particular instance of that day, month, or festival. （用于日子、月份或节日的名称之前以表示特例）一个
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The interview took place on a Friday afternoon.
采访是在一个星期五的下午进行的。
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It was a Christmas when shoppers passed by expensive silks in favor of more practical gifts.
这是一个购物者不理会昂贵的丝绸衣服而热衷于更实用礼物的圣诞节。
8 DET （从事某一职业的）一（位），一（名） You use a or an when you are saying what someone is or what job they have. （从事某一职业的）一（位），一（名）
9 DET [DET n-proper] （用于不为说话人所知的首次提到的人名前）某一（个） You use a or an in front of the names of people as a way of indicating that you do not know them or anything about them and you are saying their name for the first time. （用于不为说话人所知的首次提到的人名前）某一（个）
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The full address on a stick-on label was that of a Mrs P. R. Slater of Peterborough.
不干胶标签上的完整地址写的是彼得伯勒的一位P. R. 斯莱特太太。
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A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
据报道，一位叫马修·欧文斯的博士在前往土耳其东北部考察的途中失踪了。
10 DET [DET n-proper] （用于人名前，表示与该人有相同特性或品质）类似…的一个（或一位） You use a or an in front of the names of people when you want to refer to someone else who has the same qualities or character as the person named. （用于人名前，表示与该人有相同特性或品质）类似…的一个（或一位）
11 DET [DET n-proper] （用于姓氏前，表示某人属于某姓氏家族）一位姓…的人 You use a or an in front of a surname when you want to refer to someone who belongs to the family with that surname. （用于姓氏前，表示某人属于某姓氏家族）一位姓…的人
12 DET （用于艺术家名字前）一幅…的画，一件…的雕塑作品 You use a or an in front of the names of artists to refer to one individual painting or sculpture created by them. （用于艺术家名字前）一幅…的画，一件…的雕塑作品
13 DET （代替数字one使用，尤用于hundred，hour和metre等表示度量的单词之前以及half, quarter和third等分数之前） You use a or an instead of the number 'one', especially with words of measurement such as 'hundred', 'hour', and 'metre', and with fractions such as 'half', 'quarter', and 'third'. （代替数字one使用，尤用于hundred，hour和metre等表示度量的单词之前以及half, quarter和third等分数之前）
14 DET （用于表示比率的短语中）每一 You use a or an in expressions such as eight hours a day to express a rate or ratio. （用于表示比率的短语中）每一
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