If your computer is connected to more than one display or to a TV or projector, you can show the image on your main display on the other display.

如果您的电脑连接到多台显示器或电视机或投影仪，您可以在其他显示器上显示主显示器上的图像。

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Alternatively, you could hook up your laptop or smartphone to the mini projector and the run the presentation that way.

另外，你可以把自己的笔记本电脑或智能手机连上投影仪，然后以那样的方式运行演示。

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The system beams a keyboard or menu onto the user's forearm and hand from a projector housed in an armband.

这个系统将键盘和菜单传输到用户前臂上，并且通过安置在臂带的投影机进行控制。

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If you're not the owner of a 720p HD display or projector, the question may seem arcane and pointless.

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People who use their phones to make business presentations could also station their handsets near a screen or projector and use gestures to control the device from elsewhere in a room.

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The important thing is to back those points up, with another visual aid, even something as simple as hand illustrating your points on a white board or overhead projector.

FORBES: The Digital Age: Why Adding Visuals Will Transform Your Presentation