It includes ultraviolet at the far end of the non visible spectrum and three infrared bands at the other end.

它包括非可见光谱，一端是紫外线，另一端是三个红外线波段。

Three of them are in the infrared band as it were, outside the visible spectrum and one ultraviolet and they produce images which are not accessible to the human eye.

红外波段有三种，这些都是不可见光谱，还有一种紫外线，它们能显示出肉眼看不到的东西。