Definition
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someone
Someone is an indefinite pronoun used to refer to an unspecified person.
有人是一个不确定的代词,用于指代一个不特定的人。
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Someone left their umbrella at my house.
有人把他们的雨伞留在我家。
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I think someone is knocking on the door.
我觉得有人在敲门。
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Someone should call the police if they see anything suspicious.
如果有人看到任何可疑的事情,应该打电话给警察。