A device for converting electromagnetic radiation in the infra-red, visible and/or ultra-violet regions of the spectrum into an electric current.
一种把下述光谱范围内的电磁辐射转换成电流的装置：红外线、可见光和／或紫外线。
In the spectrum, distinct colours shade into each other.
在光谱中，截然不同的颜色相互融合起来。
Red and violet are at opposite ends of the spectrum.
红色和紫色位于光谱相对的两端。
