文件夹(如“头文件”)不与文件系统文件夹(在内部，此类文件夹被称为过滤器)对应。

Folders (like "header files") don't correspond to filesystem folders (internally, such folders are called filters).

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后过滤器用在编译完成后，编译模板保存到文件系统前，立即处理模板的编译输出(PHP代码)。

Postfilters are used to process the compiled output of the template (the PHP code) immediately after the compilation is done but before the compiled template is saved to the filesystem.

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