a mechanical device that serves to connect the ends of adjacent objects
同义词：coupling
coupler详细解释
cou.pler n.（名词）One that couples, especially a device for coupling two railroad cars.连接物，连接者：连接的事物，尤指连接两节火车车厢的装置Music A device connecting two organ keyboards so that they may be played together.【音乐】 联键音栓：连接两个风琴键盘使之能够同时演奏的装置
