名词set off: 1.structure where a wall or building narrows abruptly 同义词：set-back,setoff,offset 动词set off: 1.put in motion or move to act 同义词：trip,actuate,trigger,activate,spark off,spark,trigger off,touch off 2.leave 同义词：depart,part,start,start out,set forth,set out,take off
