一些重要的文件即使你将他们“删除”，他们还是存在磁盘中，而且很容易复原。
Sensitive files that you've "deleted" still exist on the disk and are very easy to recover.
如果锁文件存在，应该在重新启动服务器之前删除它。
If the lock file is present, delete it before restarting the server.
当进程打开了某个文件时，只要该进程保持打开该文件，即使将其删除，它依然存在于磁盘中。
When a process opens a file, it exists on disk even if deleted, as long as the process holds the file open.
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