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

同样的缺陷导致大多数常见的人盲症。

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 ： 本文平面上一般带根地图的和与和,得到这地图的和与和函数方程。