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DET
（指初次提及或非特指的人或物）一（個）
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.
例句
A waiter entered with a tray...
侍者端著托盤進來了。
He started eating an apple...
他開始吃蘋果。
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DET
（一類人或事物中非特指的）任何一（個）
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.
例句
...expensive make-up that we saw being advertised by a beautiful model...
我們所見的由一位漂亮模特代言的昂貴化妝品
I suggest you leave it to an expert...
我建議你把它留給專家來解決。
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DET
（用于前加形容詞或后加修飾語的不可數名詞之前）一（種）
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.
例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲傷。
He did have a real knowledge of the country...
他對該國的確知之甚多。
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DET
（用于物質名詞前）一（類），一（種）
You use a or an in front of a mass noun when you want to refer to a single type or make of something.
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香檳是一種名貴的備受推崇的葡萄酒。
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DET
（用于表示數量的詞組中）許多/少許/一點
You use a in quantifiers such as a lot ,a little, and a bit.
例句
I spend a lot on expensive jewelry and clothing...
我花很多錢購買昂貴的首飾和衣服。
I've come looking for a bit of advice.
我特來討教。
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DET
（一類人或事物中典型的）一（個）
You use a or an to refer to someone or something as a typical member of a group, class, or type.
例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母認為男孩子必須學會像男子漢一樣頂天立地，勇于抗爭。
...the operation a patient has had.
病人做過的手術
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DET
（用于日子、月份或節日的名稱之前以表示特例）一個
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.
例句
The interview took place on a Friday afternoon...
采訪是在一個星期五的下午進行的。
It was a Christmas when shoppers passed by expensive silks in favor of more practical gifts.
這是一個購物者不理會昂貴的絲綢衣服而熱衷于更實用禮物的圣誕節。
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DET
（從事某一職業的）一（位），一（名）
You use a or an when you are saying what someone is or what job they have.
例句
I explained that I was an artist...
我解釋說自己是個藝術家。
He was now a teacher and a respectable member of the community.
他現在是一位教師，并且是社區內受人尊敬的一員。
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DET
（用于不為說話人所知的首次提到的人名前）某一（個）
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.
例句
The full address on a stick-on label was that of a Mrs P. R. Slater of Peterborough...
不干膠標簽上的完整地址寫的是彼得伯勒的一位P. R. 斯萊特太太。
A Dr Matthew Owens was reported missing while on an expedition to north-eastern Turkey.
據報道，一位叫馬修·歐文斯的博士在前往土耳其東北部考察的途中失蹤了。
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DET
（用于人名前，表示與該人有相同特性或品質）類似…的一個（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.
例句
When I listen to her play I can hear a new Nigel Kennedy.
從她的演奏中我聽出了新一代的奈杰爾·肯尼迪。
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DET
（用于姓氏前，表示某人屬于某姓氏家族）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.
例句
As far as I can recall, Patti was a Smith.
我記得帕蒂是姓史密斯的。
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DET
（用于藝術家名字前）一幅…的畫，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.
例句
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
多數人不難理解為什么凡·高的作品是天才之作。
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DET
（代替數字one使用，尤用于hundred，hour和metre等表示度量的單詞之前以及half, quarter和third等分數之前）
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'.
例句
...more than a thousand acres of land.
1,000多英畝地
...a quarter of an hour...
一刻鐘
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DET
（用于表示比率的短語中）每一
You use a or an in expressions such as eight hours a day to express a rate or ratio.
例句
Prices start at ￡13.95 a metre for printed cotton...
印花棉布以每米13.95英鎊的價格起售。
The helicopter can zip along at about 150 kilometres an hour.
該直升機能以每小時150公里左右的速度疾進。