■先看以下说明：

1. Michael Swan著Practical English Usage (Third Edition 2005) p517：

The police are looking for a fair-haired man in his twenties. (Not The police is looking... OR A police ...)

2. L. G. Alexander著 Longman English Grammar《朗曼英语语法》(雷航等译 外语教学与研究出版社2002年月第16次印刷)p82：

下列集合名词没有复数，但他们须用复数动词：..., the police (警察),...。

The police have surrounded the building. 警察包围了那座建筑物。

3. N D Turton and J B Heaton主编的Longman Dictionary of Common Errors (Eleventh impression 2003) p263：