A similar deficiency accounts for the most common form of dichromatic color blindness in humans.

同样的缺陷导致了大多的人类双色色盲症。

Abstract : In this paper, we study the chromatic and dichromatic sum functions of rooted general maps on the plane.The chromatic and dichromatic sum function equa- tions of such maps are obtained.

要 ： 本文研究了平面带根地图的色和与双色和,得到了这类地图的色和与双色和函方程。