Alternate connection retry: If network interruption lasts more than two minutes, reconnect to another physical server or virtual machine via alternate network connections.
备用连接重试：如果网络中断持续时间超过2分钟，那么要通过备用网络连接重新连接到另一台物理服务器或虚拟机。
If network interruption last more than two minutes, attempt to reconnect to another server via alternate connections.
如果网络中断超过两分钟，即尝试通过备用连接重新连接另一个服务器。
Emergent events in urban rail transit threaten the safety and order of the network. Heavy events will result in operation interruption, serious train delay and also passenger delay.
突发事件威胁城市轨道交通网络的安全与秩序，严重的将导致运营中断和列车与乘客的大规模延误。
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