In one type of squirrel monkey, the males lack a visual pigment called L-opsin.
在一种松鼠猴中，雄松鼠猴缺少一种叫做L视蛋白视觉色素。
Vision is resulted in the reaction of visual purple that is a pigment of sensitization.
视觉的产生是感光色素——视紫红质发生光化学反应的结果。
Ours is still the result of an evolutionary reclamation job and remains one pigment short of the tetrachromatic visual system found in birds and in many reptiles and fish.
我们的色觉依旧是演化改造工程的结果，比起鸟类与许多爬行类及鱼类的四色视觉系统，我们还是少了一个色素。
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