虚拟机本质上就像一个只有三个按钮的设备：启动/关闭、暂停和复位。
The virtual machine essentially becomes an appliance with three buttons: power on / off, suspend, and reset.
清单13说明了如何创建一个表单复位按钮，但是不要在新表单中使用它：最终用户永远不会有意识地单击Reset按钮。
Listing 13 shows you how to create a form reset button, but don't use this in new forms: no end user ever hits the reset button on purpose.
复位：点击该按钮将重置镜头畸变模型到默认状态。
Reset: Clicking this button will reset the lens distortion model to its default state.
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