双向工频自动通信系统 TWACS ; Two Way Automatic Communication System-TWACS
双向无线电通信系统 [通信] two-way radio system
双向工频通信系统 Two Way Automatic Communication System ; TWACS
双向通信系统，显示设备，基本设备及双向通信的方法。
Dual direction communication system, display device, base arrangement and dual direction communication method.
LLCD是NASA的第一个使用激光而不是无线电波的双向通信系统。
LLCD is NASA's first system for two-way communication using a laser instead of radio waves.
基于ITS的智能车辆定位导航系统可划分为三个层次：自主导航系统、单向通信系统和双向通信系统。
Based ITS Intelligent Vehicle location and navigation system could be divided into three levels: autonomous navigation systems, communications systems and two-way one-way communication system.
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