1N-PLURAL [oft NOUN n](尤指依靠电或无线电波的)通信系统,通信Communications are the systems and processes that are used to communicate or broadcast information, especially by means of electricity or radio waves. (尤指依靠电或无线电波的)通信系统,通信
...a communications satellite.
通讯卫星
...communications equipment.
通讯设备
2N-COUNT 消息;信息 A communication is a message. 消息;信息 [formal]
The ambassador has brought with him a communication from the President. [+ from]