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-control信号控制signal screening信号筛选Signal canceller信号对消器signal recording信号拾取signal interface测试功能接口Signal substance信号物质Signal isolation信号隔离signal equipment信号器材signal receivers信号接收机signal reception信号接收