Audio and video system of subway train is one of important part in urban rail transportation.

轨道交通机车的车载音视频系统是整个机车系统的重要组成部分之一。

youdao

Audio and video system of subway train is one of important part in urban rail transportation.

轨道交通机车的车载音视频系统是整个机车系统的重要组成部分之一。

youdao