要获取唯一系统标识符，可以使用带- Mu或- MuL标志的uname命令。
To get a unique system identifier, use the uname command with the -mu or -mul flag.
第一个特性是一个可视化标志，使用户知道对特定文档的获取操作仍然在后台执行，但是还没有完成。
The first feature is a visual indicator to the user that the retrieval for a specific document is continuing in the background, but has not yet finished.
目标站点使用该标志从源站点请求所需要的信息而不需要明确地从主体获取。
The target site USES the token to request the information it needs from the originating site without having to get it explicitly from the subject.
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