In fact, most other primates have scleras that are so dark that they camouflage which way the eyes are looking.
In fact, most other primates have scleras that are so dark that they camouflage which way the eyes are looking.
事实上，大多数灵长动物之所以巩膜颜色很深，是因为可以掩藏自己目光的方向。