要备份的最重要的文件大概是你的文档，图片，音乐以及其他用户文件，但要备份的不单单是这些，请接着看下去吧。
The most important files to backup are probably your documents, pictures, music, and other user files, but they are not the only files that you need to backup. Let's walk through some of them.
包含文件(或者头文件)定义了在操作系统中或特定的库中使用的常量、宏以及其他结构。
Include files (or header files) define constants, macros, and other structures used in the operating system or in a particular library.
文件是否将与信封及其他可选文件一同封装？
Are the files to be packaged along with the envelope and other optional files?
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