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

同样的缺陷导多数常见的人类双色色盲症。

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 ： 本文研究平面上一般带的色和与双色和,得到这类的色和与双色和函数方程。