这封信并重申了国防部的要求：维基揭密网站必须归还所有文件，并从其网站信息库里删除和销毁那些已经在维基揭密网站刊登出来的文件。
The letter also repeat's the department's demand that all the documents be returned, and that those which already have been published be removed from Wikileaks' databases and destroyed.
电子书就只是冷漠数字信息的结果，一个删除键就可以将其彻底销毁，不留踪迹。
Ebooks are just bits and bytes that can be deleted at a push of the button.
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