A user or group can have more than one entry; this allows for further fine tuning of access.
一个用户或组可以有多个条目;这样就可以更精细地调整访问权。
The file for each server should contain an entry for both servers as well as two group definitions. Each group represents an er node.
每个服务器的文件应该包含针对两个服务器的一个条目及两组定义。
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