They chose the correct photograph by breaking an infrared beam near the flat surface showing the photo.

它们可以通过感应屏幕上显示的红外光束来选择名人的照片。

We have a transmitter, which is like an inner solar that delivers an invisible infrared beam and the receiver converts the infrared beam back into electricity.

我们有一个发射器，它就像一个内部的太阳能，它发出不可见的红外光束，接收器将红外光束转换回电能。