Snakes include some infrared in their reality, and honeybees include ultraviolet in their view of the world, and of course we build machines in the dashboards of our cars to pick up on signals in the radio frequency range, and we built machines in hospitals to pick up on the X-ray range.
蛇可以看到红外线， 蜜蜂可以看到紫外线， 我们也当然能在汽车的 仪表盘内设立装置 来接收无线电信号收听广播， 医院里也有专门的X射线设备。