In this example, we have a single page application.
本例中，只有一个页面。
With GWT we are no longer using a page navigation paradigm, this is a single page application, or more exactly an entire application accessed via a single URL.
基于GWT的应用不再以页面导航的方式工作，它们被称作单页面程序，更准确的说就是只通过单个url就能完整访问的应用程序。
Why do we need a Single Page Application?
为什么我们需要一个单页面应用程序?。
You will develop a single-page application featuring a map of your neighborhood or a neighborhood you would like to visit.
你将开发一个单页应用，展示你所在街区或你想要参观的街区的地图。
The transition to a single-page application puts more of a burden on the browser because I need to preserve application state at the client.
转换成单页应用程序后，将更多的责任放到了浏览器端，因为需要在客户端保持应用程序的状态。
The transition to a single-page application puts more of a burden on the browser because I need to preserve application state at the client.
转换成单页应用程序后，将更多的责任放到了浏览器端，因为需要在客户端保持应用程序的状态。
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