所有200种左右的灵长类动物都有黑色的眼睛和几乎不可见的巩膜。
All 200 or so species of primates have dark eyes and a barely visible sclera.
图5老虎眼睛的形态差异：26号照片中，右眼睁大，瞳孔位于眼睛中央，黄色的巩膜环绕着一个白色中心点。
Fig. 5 Dissimilarity in form of the tiger's eyes: In photo no. 26, the right eye is largely opened and the pupil is in the center of the eye with a bright central point surrounded by a yellow sclera.
如果观察人类眼睛，你会发现在白色的巩膜上有血管存在，而角膜却没有。
If you study a normal eye you will see blood vessels in the whites of the eye but these stop at the cornea.
如果观察人类眼睛，你会发现在白色的巩膜上有血管存在，而角膜却没有。
If you study a normal eye you will see blood vessels in the whites of the eye but these stop at the cornea.
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