安装在便携式设备上的触摸屏有特殊的吸引力，因为虚拟按钮与其它控制程序只有在需要时才显示。

Touch screens have particular appeal in portable devices because virtual buttons and other controls appear on screen only when required.

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只需轻轻敲一下虚拟的按钮就可以让屏幕瞬间消失。

Tap a virtual off button to make the screen disappear.

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然后通过点击菜单栏的Power On按钮启动虚拟机，如图7所示。

Then start up the virtual machine by clicking on the Power on button on the menu bar as as shown in Figure 7.

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