你可能不知道第三眼睑，但你拥有它。
不可见有第三眼睑。
人类还保留着第三眼睑的痕迹(没有用，图片中可以看到)。
Humans have a remnant (but non-working) third eyelid (you can see it in the picture above).
眼睛应是清洁明亮的，没有污垢及外露的第三眼睑。
Eyes should be clear and bright. No discharge and no sign of the third eyelid.
人类的第三眼睑已经很小了，不过有些人种更为明显。
It has become quite small in humans, but some populations have more visible portions than others.
当你看一直猫眨眼的时候，你会看到它眼睛上有一道白膜，这叫做第三眼睑。
If you watch a cat blink, you will see a white membrane cross its eye - that is called its third eyelid.
犬类的眼部肿瘤发现于眼睑，结膜，第三眼睑，角膜，巩膜，虹膜，睫状体，视网膜，脉络膜，视神经和眼眶。
Ocular tumors in dogs are found in the eyelid, conjunctiva, third eyelid, cornea, sclera, iris, ciliary body, retina, choroid, optic nerve, and orbit.
犬类的眼部肿瘤发现于眼睑，结膜，第三眼睑，角膜，巩膜，虹膜，睫状体，视网膜，脉络膜，视神经和眼眶。
Ocular tumors in dogs are found in the eyelid, conjunctiva, third eyelid, cornea, sclera, iris, ciliary body, retina, choroid, optic nerve, and orbit.
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