1. DET 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. (用于首次提及或泛指某人或某物) 一 (個(gè))

A waiter entered with a tray bearing a glass and a bottle of whisky. 一名服務(wù)員端著一個(gè)放有一只玻璃杯和一瓶威士忌酒的托盤(pán)進(jìn)來(lái)了。

He started eating an apple. 他開(kāi)始吃蘋(píng)果。

2. DET 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. 用于指一類(lèi)人或物，不需要特指

I suggest you leave it to an expert. 我建議你把它留給專(zhuān)家來(lái)處理。

Bring a sleeping bag. 帶個(gè)睡袋來(lái)。

3. DET 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. 一種 (用于前有形容詞或后有修飾語(yǔ)的不可數(shù)名詞前)

The islanders exhibit a constant happiness with life. 這些島民表現(xiàn)出一種對(duì)生活的持久的幸福感。

4. DET You use a or an in front of a mass noun when you want to refer to a single type or make of something. 一種 (用于物質(zhì)名詞前，特指某物的種類(lèi)或成分)

Bollinger "RD" is a rare, highly prized wine. 是一種罕見(jiàn)的、非常名貴的葡萄酒。

5. DET You use a in quantifiers such as a lot, a little, and a bit. 用在量化詞組中，如(a lot), (a little), (a bit##bit)等

I spend a lot on expensive jewellery and clothing. 我在昂貴的首飾和衣服上開(kāi)銷(xiāo)很大。

6. DET You use a or an to refer to someone or something as a typical member of a group, class, or type. 指某人或某物是一個(gè)團(tuán)隊(duì)、階層或類(lèi)型中典型的一員或一部分

Some parents believe a boy must learn to stand up and fight like a man. 一些家長(zhǎng)認(rèn)為一個(gè)男孩必須學(xué)會(huì)像男子漢一樣奮起戰(zhàn)斗。

7. DET 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. 用于某一天、某一月份或某節(jié)日前，特指在該天、該月或該節(jié)日發(fā)生的事件

The interview took place on a Friday afternoon. 該面談是在一個(gè)星期五下午進(jìn)行的。

8. DET You use a or an when you are saying what someone is or what job they have. 用于說(shuō)明某人的職業(yè)

I explained that I was an artist. 我解釋說(shuō)我是一位藝術(shù)家。

9. DET 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." 一 (代替)(one)

...more than a thousand acres of land. …一千多英畝的土地。

10. DET You use a or an in expressions such as eight hours a day to express a rate or ratio. 每一 (用于速率或比率的表達(dá)中)

Prices start at $13.95 a yard for printed cotton. 印花棉布開(kāi)價(jià)為$13.95一碼。

11. V →an informal or dialect word for have

they'd a said if they'd known

12. PREP →(usually linked to the preceding noun) an informal form of of

sorta sad

a kinda waste

13. SYMBOL for acceleration 加速度