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

同样致了大多数常见人类双盲症。

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 ： 本文研究了平面上一般带根地图与双,得到了这类地图与双函数方程。