系统文件已恢复。
Whenever logout is performed the files should be removed, and the system should be restored to some default state.
每当用户登出时，文件都要被清空，系统应该恢复到默认状态。
The system administrator must ensure that the ownership of the affected files and directories are manually restored.
管理员必须确保受影响的文件和目录的所有权能够得到手动恢复。
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