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泛指某一类人、事、物，相当于any
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The best way to learn a language is to live among its speakers.
I know that the pressure to stay slim is a problem, especially for an actress.
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泛指某人或某物，但不具体指明何人或何物，相当于a certain或some
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A John called you just now.
There is a car in the yard.
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表示数量，有“一”的意思，相当于one
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A bird in the hand is worth two in the bush.
I need a student to help me.
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表示“每一”，相当于per
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The Chinese Export Commodities Fair is held in Guangzhou twice a year.
The car is travelling at 100 miles an hour.
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用在序数词前，表示“又一，再一”
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A second plan was devised and is now going forward.
Please give me a second chance.
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抽象名词表示一个具体情况，一个具体动作
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Their performance became a success.
Sometimes disappointment can make you feel like a failure.
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在一些物质名词前加不定冠词，表示“一阵，一场，一份，一种”
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There will be a heavy storm.
I went to buy a paper at the corner dairy.
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用在有形容词修饰的一日三餐前
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We just had a big supper.
He has a light breakfast every morning.
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用在有形容词修饰的季节、日期前
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We had a very hot summer.
We had a wonderful Sunday.
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与形容词比较级连用，表示“一个更……的……”
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Young men climbed on buses and fences to get a better view.
In recent years, the small town has enjoyed a bigger boom than ever.
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用在so, as, too, how等修饰的形容词之后，单数可数名词前
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This is too small a room for us to live in.
Russian is so difficult a language for us Chinese to learn.
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用在such, what, many, half等词后，修饰单数可数名词
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He would be the last person who would do such a thing.
What a beautiful flower it is！
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与most＋adj.连用，修饰单数可数名词表示“很，非常”
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That's a most expensive supper.
We had a most enjoyable evening here.
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用于同源宾语中
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Live a happy life.
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