It gets to be cumbersome to try to scroll back to find out what a person said, especially when several people are on online almost at the same time, each one competing for time to write a message.
如果试图回滚以查找某个人的消息的内容，这种方式就会显得十分笨拙，特别是当几个人几乎同时在线，并且每个人都在抢时间编写消息的时候，这个问题就更为突出。
Similarly, messages destined for client applications are held in server-side message queues and then sent to the client applications when the device is back online.
同样，要发送给客户机应用程序的消息被保存在服务器端消息队列中，当设备恢复在线状态时，将这些消息发送给客户机应用程序。
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