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。
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。
They need to provide 24 hours 365 days one year without interruption of network service, and timely response to the request of massive users.
包括提供全年365天24小时无间断的网络供应，以及对海量用户访问及时的请求响应。
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