plainclothesman
1. Superiors would evaluate a plainclothesman on his dependability.
上级评价一个便衣人员的标准, 是看他是否忠诚可靠。
2. REVEALING THE SECRET OF CHINA'S FIRST PLAINCLOTHESMAN BUREAU
中国首个便衣警察局揭秘
3. An Investigation and Practice in the Plainclothesman Patrol in Rui'an City
便衣巡逻在瑞安的探索与实践