提供警方線索的線民稱 undercover agent or agent undercover? 不對 那是 臥底警探 或 便衣警探線民稱為(Police) Informant補充密探 Secret Agent
to offer something to somebody He had offered cocaine to an undercover police officer. to offer somebody something They haven't offered ...
...一部臥底警察間 的鬥智故事 the movie is about police worked as an undercover agent of contest