不使用PPT的另一个好处就是你不用一直待在讲台上，不停地按着鼠标。
One of the great things about not using a slide presentation is that you do not have to hide behind a lectern pressing the mouse.
钮控件，状态改变意味着当鼠标按键在控件之上按下时，按钮进入或保持按下的状态。
For a pushbutton control, a state change means that while the mouse button is down and directly over the control, the button will enter and remain in the pushed state.
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