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a2
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a2

 
pronunciation:
uh [or] eI
part of speech: indefinite article
definition 1: any one of a group or kind.
(泛指)一(个)
A horse has hooves.Somebody call a doctor!The magician told her to pick a card.马长着蹄子。快叫医生!魔术师让她挑选一张牌。
definition 2: used to introduce one particular thing or person of a group or kind, but one which is not considered known to the listener.
(指初次提及或非特指的人或物)一(个)
I walked home with a friend from school.A man with a suitcase got on the bus.我和一个朋友从学校走回家。一个带着旅行箱的男人上了公共汽车。
definition 3: one, as a quantity.
一(个)
He dumped a cup of flour into the mixing bowl.他倒一杯面粉在搅拌用的碗里。