清单5改进了清单4来提供更好的交互性，允许用户在应用程序中输入搜索关键字，并查看匹配该搜索术语Wikipedia页面。
Listing 5 improves Listing 4 to make it more interactive, allowing a user to enter a search term in the application and see Wikipedia pages matching that search term.
这种输入比仅单击按钮更加具有交互性。
This typing is more interaction than just clicking a button. In our example, the buttons mean the following
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