File Spec: is a list of file names or file name wild CARDS.

文件规范：是文件名称或文件名通配字符的一个列表。

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They are made up of a list of file name extensions, and each extension appears on its own line.

它们由文件扩展名列表组成，每个扩展名占一行。

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The script is passed the index of the file the user wants to expand, so it has to list the directory again and get the appropriate file name.

该脚本传递用户希望展开的文件的索引，因此必须在此列出目录并获得适当的文件名。

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