signāls 形容词
微软	signal (A notification of an event that triggers an activity); alarm (An alert that is set by the user to be activated at a particular time)
运输, 机械工程	tell-tale

signals : 34 短语, 6 学科

医疗的	4
微软	8
机械工程	1
药店	1
运输	17
通讯	3