Based software are: dial, speed dial, Internet (Internet), alarm clock, calendar, calculator, electronic mail, notepad, gallery, QQ, recorder and so on.

基础软件有：拨号盘、快速拨号、互联网(上网)、闹钟、日历、计算器、电子邮件、记事本、图库、QQ、录音机等等。

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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。

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