In a real application, you might not add such buttons if you want to keep the user interface simple and do both saving and restoring transparently and automatically.
在真实的应用程序中，如果希望保持用户界面简洁并能够透明、自动地保存和恢复表单，则不需要添加这些按钮。
The more complex your application's task, the more important it is to keep the user interface simple and focused.
程序中越是复杂的功能，简洁突出的用户接口就越是重要。确保您的设计反映了用户的心智模型。
Intuitive user interface, simple operation.
界面直观，操作简单。
Intuitive user interface, simple operation.
界面直观，操作简单。
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