The base class for an SDI application's main frame window. Also the base class for all other frame window classes.
SDI应用的主框架窗口的基类。也是所有其它框架窗口类的基类。
The frame is shown as the main window, and it is where the Place Order button is located.
框架会作为主窗口来显示，而且它就是PlaceOrder按钮的位置所在。
The frame is shown as the main window, and it is where the Place Order button is located.
框架会作为主窗口来显示，而且它就是PlaceOrder按钮的位置所在。
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