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。
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。
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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