Grammar Note
police 是集合名词，永远用复数谓语；不能说 a police / two polices，表示单个警察要说 a police officer。
警察；警察队伍
先理解核心含义，再看它在真实句子里的用法。
警察；警察队伍
the police force
The police are investigating the theft at the shop.
警方正在调查商店里的盗窃案。
警察队伍
the force of policemen and officers
She called the police when she heard a strange noise.
她听到奇怪的声音后报了警。
The police have released a statement about the accident.
警方就这起事故发布了一份声明。
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police 是集合名词，永远用复数谓语；不能说 a police / two polices，表示单个警察要说 a police officer。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.