n.便衣，便服，便衣警察，便装...

A couple of plain-clothes men had been sniffing round his apartment.几名便衣男子一直在他的公寓周边打探。officers in plain clothes便衣警察plain-clothes detectives from the vice squad取缔性或毒品犯罪行动队的便衣侦探...

plain clothes的音标：plain clothes的英式发音音标为：[plein kləuðz]plain clothes的美式发音音标为：[plen kloz]...