我们会有便衣警官时刻守护着你。
We 'll have undercover officers watching all the time .
三名便衣警官叫我从车上下来。5.
Eg. Three officers in plain clothes told me to get out of the car .
便衣警官冲进人群，帮助头戴警盔、手握警棍的警察去抓流氓。
Plainclothes officers darted into the crowds to tackle hooligans , assisting helmeted , baton-wielding poliee .
便衣警官