先作备份吧!
在i之后跟着一个扩展名将使用该扩展名对已编辑的文件作备份。
Following the I with an extension will make a backup of the edited file using that extension.
为防止资料因意外而遗失,应经常把资料在多种储存媒体(如 CD或DVD)上作备份。
To protect against accidental data loss, you should backup your data frequently on more than one type of storage media such as CD-R, DVD-R.
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