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；
The man suddenly fell to the ground, with his eyes closed and his mouth open.
那个男人突然摔倒，双眼紧闭，大口喘气。
I closed my eyes and jump to the ground.
我闭紧眼睛一口气跳了下去。
I closed my eyes and jump to the ground.
我闭紧眼睛一口气跳了下去。
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