移动，复制，删除和更名文件。

Move, copy, delete and rename a file.

youdao

说明如何复制、删除和移动文件和文件夹。

Shows how to retrieve text from a file one line at a time.

youdao

说明如何复制、删除和移动文件和文件夹。

Shows how to retrieve text from a file one line at a time.

youdao