这个Makefile中包含需要编译的源文件的列表，并且它还包括启用或者禁用并选择SQLite包中的某些代码片段的常数。
The Makefile contains a list of source files to build, and it also includes constants that enable or disable and choose certain snippets of code in the SQLite package.
通常数据库的备份过程比文件系统来得简单。
Often the backup process is easier for databases than for a file system.
常数级压缩方法利用排列组合原理，适于压缩字节内容无规律的文件。
The data compressing method based on constant grade makes use of permutation and combination theory.
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