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- 一个便衣侦探搭乘火车旅行。
A plainclothes detective travelled on the train.
- 便衣警察在这位外国首脑进行国事访问期间混入在人群中以防骚乱。
Policemen in plain clothes intermingled with the crowd to prevent trouble during the foreign ruler's state visit.
- 有个便衣警察整天秘密监视那个罪犯。
A policeman in plain clothes shadowed the criminal all day.
- 警探穿著便衣。`
The detectives were in plain clothes.
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