Two way transmission between the train and ground facilitates closed-loop acknowledgement.
车-地之间双向传输，信息闭环确认；
There is a need of two-way information transmission between the train and the ground.
要求列车与地面之间进行双向、大量信息传输。
There is a need of two-way information transmission between the train and the ground.
要求列车与地面之间进行双向、大量信息传输。
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