一个小技巧是给每组信息标上序号，这样用户可以知道还有多少步骤剩下，而且会有前进的方向，按照数字标识的顺序走即可。
A clever trick is to number the chunks to allow users to perceive how much is left and also to perceive that they are moving forward. It provides clear direction of a way forward.
单位序号的后面，每面旗帜传达了一个简短的信息。
Underneath the unit number, each flag displayed a short message.
通过在广播确认消息中捎带哪些进程产生了新的检查点的信息，使每个进程的检查点序号在所有进程中是一致的。
Through piggybacking the information about which processes have taken new checkpoint in the broadcast message, the checkpoint sequence number of each process is consistent in all processes.
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