它返回的事实-1表明没有文本文件在您的工作目录的上一级目录。

The fact that it returns -1 indicates that there are no text files in the directory above your working directory.

youdao

它返回的事实-1表明没有文本文件在您的工作目录的上一级目录。

The fact that it returns -1 indicates that there are no text files in the directory above your working directory.

youdao