You can't, because the file was saved; there is no UNDO here, so the programmer would need to either recover the backup copy or retype it.

不能使用它，因为文件已被保存；此处没有UNDO命令，因此，程序员需要恢复备份或重新输入。

youdao

You can't, because the file was saved; there is no UNDO here, so the programmer would need to either recover the backup copy or retype it.

不能使用它，因为文件已被保存；此处没有UNDO命令，因此，程序员需要恢复备份或重新输入。

youdao