地区: area; district; region地区信号中心: area signal center沿海地区信号: coastal signals地区信息系统: geobased information system信号系统: beaconage; signal system; signal sytem; signaling system信号系统图: signaling diagram保安信号系统: protective signaling system报警信号系统: alarm signal system闭塞信号系统: block signal system闭锁信号系统: block signal system; block-signal system第二信号系统: second signal system; secondary signal system; secondary signaling system第一信号系统: [生理学] the first signal system电子信号系统: electronic signaling system二级信号系统: secondary signal system; secondarysignal systemm发光信号系统: luminous-signal system辅助信号系统: auxiliary signaling system告警信号系统: alarm signal system国际信号系统: international signalling system火警信号系统: fire alarm system; fire warning system警报信号系统: alarm signal system; alarm signalling system; alarm system; annunciator system警告信号系统: warning system联支信号系统: coordinated-signal system两种信号系统: two signaling system陆空信号系统: air-ground signaling system脉码信号系统: pulse code signalling system
