应用程序和常规用户所使用的符号名称不应该为表1中提及的任何主机名，并且他们应该只使用这些主机名的别名，如表2中所示。
The symbolic name used by applications and regular users should not be any of the host names referenced in Table 1, and they should only use an alias to these host names, as shown in Table 2.
文件系统操作函数：用于创建常规文件、目录和符号链接；复制和重命名文件；提供删除功能。
File system-manipulation functions: Meant to create regular files, directories, and symbolic links; copy and rename files; and provide for deletion.
还要注意，与常规属性不同，类常量不以美元符号开始。
Also notice that unlike regular properties, a class constant does not begin with the dollar sign.
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