多模式应用的构架类似于普通网页系统的构架，浏览器向服务器提交请求，服务器返回页面，如 图 1所示。
The architecture of multimodal applications is similar to Web applications, where the browser sends a request to the server, and the server responds with pages (see Figure 1).
控制器是form handlers和其它服务器端机制，使浏览器操作能够开始更改模式并随后更新视图。
The controllers are the form handlers and other server-side mechanisms for enabling browser actions to initiate changes to the model and subsequently update the view.
这个命令会在监视模式下运行编译器，启动开发服务器，在浏览器中启动我们的应用， 并在后续构建《英雄指南》过程中，应用能持续运行。
This command runs the compiler in watch mode, starts the server, launches the app in a browser, and keeps the app running while we continue to build the Tour of Heroes.
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