Two plain-clothes detectives lingered by the doorways.两个便衣侦探在门口徘徊。
There were both uniformed and plain-clothes officers inside.里面既有穿制服的警官, 也有便衣警官。
英汉双解词典包含368430条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。