您的样例应用程序仍然处于初级阶段：它知道如何提供索引页面和一些静态内容，并且有一个可用于进一步开发的良好主模板。
Your example application is still in its early stages: It knows how to serve up the index page and some static content, and it has a decent master template ready for further development.
静态文件、模板和代码都来自磁盘，组成数据库的数据表和索引也来自磁盘。
Static files, templates, and code are served from disk, as are the data tables and indexes that make up the database.
保存对主模板的更改，并重新访问应用程序的索引页面。
Save your changes to the master template, and revisit your application's index page.
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