plain-clothes
01
便衣, 穿便衣的
(of a police officer) dressed in civilian clothes while on duty
例子
The detectives dressed in plain-clothes to blend in with the crowd during the undercover operation.
侦探们穿着便衣以便在卧底行动中融入人群。
The plain-clothes officers quietly monitored the suspect's movements from across the street.
便衣警察从街对面静静地监视着嫌疑人的一举一动。
