通过使用纸上原型等技术，我们测试了页面布局和用户交互。

Using various techniques, such as paper prototypes, we tested page layouts and user interaction.

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用户访问服务和用户交互服务属于应用程序服务层。

User access services and user interaction services are part of the application services layer.

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注意，这个程序关于处理实际绘图和用户交互的部分十分简短。

Note that the parts of the program that handle the actual plotting and user interaction are remarkably small.

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