可以扩展任何功能，从增加命令别名直至创建全新的命令集。

Extending the functionality can include anything, from adding a single alias to a command, to creating a completely new set of commands.

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这表示它完成的不仅仅是个文件名 -- 事实上是任何事，从命令到别名到环境变量都可以。

This means it can complete more than just filenames - anything at all in fact, from commands to aliases to environment variables.

youdao

由于别名是一种展开形式而不是替换，它使您可以继续向别名命令添加选项和参数。

Because the alias is an expansion and not a replacement, it enables you to continue adding options and arguments to an aliased command.

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