存储在磁盘上的每个文件都有一个所有者和一个组，尽管用户和组的实际名称不存储在磁盘上。

Each file stored on disk has an owner and a group, however the actual names of the user and group are not stored on disk.

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实际上，这个高层对象只是一个名称空间——一个可以将一组功能捆绑在惟一一个名字之下的容器。

Actually, this top-level object is simply a namespace — a container that allows you to bundle a set of functionality under a unique name.

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