signal to发往 ... 的信号signaln.信号；标志v.(发信号)通知、表示adj.显著的signal inverter信号变换器Signal compress信号压缩signal sampling信号抽样signalling buoy信号浮标signal receiver多频信号接收器signal of taboo禁忌符号signal rectifier信号整流器signal integrate信号完整性signal measuring信号检测signal unit back信号机背板