当您需要一个文件(或目录)别名时，您使用链接，目的可能是提供一个更方便、简短的路径。

You use links when you need an alias for a file (or directory), possibly to provide a more convenient or shorter path.

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也就是说，通过ISP上网的个人用户不需要持续访问ISP的别名文件就可以管理邮件列表了。

This means someone running a personal machine through an ISP account can manage a mailing list without continuing access to the ISP's alias files.

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使用hosts文件把这些别名映射到一个实际实例和相关联的IP地址。

Map these aliases into an actual instance and its associated IP address using the hosts file.

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