third eyelid

同根派生

They also have a third eyelid, called a nictitating membrane, which protects their eyes, particularly when they attack.
眼部还有一个第三眼睑，叫做瞬膜，可以在猛禽发动攻击时保护它们的眼睛。
If you watch a cat blink, you will see a white membrane cross its eye - that is called its third eyelid.
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。
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。
Signs include enophthalmos (sunken eye), miosis (small pupil), elevated third eyelid, and ptosis (drooping of the upper eyelid).
症状包括眼球内陷、瞳孔缩小、第三眼睑上移和上眼睑下垂。
There is only one known species of primate that still has a functioning third eyelid, and that is the Calabar angwantibo (closely related to lorises) which lives in West Africa.
只有一种一直的灵长类动物还保存着第三眼睑的功能，就是生活在西非的金熊猴（跟狐猴是近亲）。