那就需要覆盖电子文件或电子邮件的信息，使得用专业软件也不能再取回这些信息。
That involves overwriting the information in the electronic document ore-mail so that it can no longer be retrieved using file recovery software.
那就需要覆盖电子文件或电子邮件的信息，使得用专业软件也不能再取回这些信息。
That involves overwriting the information in the electronic document ore-mail so that it can no longer be retrieved using file recovery software.
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