police没有复数形式。police的意思:n.警察部门,警方,警察,治安;vt.(警察、军队等)巡查,维护治安,(委员会等)监督,管制;adj.警察的,有关警察的;过去式policed,现在分词policing,过去分词policed。

例句
1、He dodged when the police fired at him.
警察向他开枪时,他躲开了。

2、The informer betrayed them to the police.
告密者把他们出卖给了警察。

3、He stalled the police for ten minutes so his accomplice could get away.
他在警察面前拖延了十分钟,使他的同谋得以逃走。
