third eyelid

同根派生

They also have a third eyelid, called a nictitating membrane, which protects their eyes, particularly when they attack.
眼部還有一個第三眼瞼，叫做瞬膜，可以在猛禽發動攻擊時保護它們的眼睛。
If you watch a cat blink, you will see a white membrane cross its eye - that is called its third eyelid.
儅你看一直貓眨眼的時候，你會看到它眼睛上有一道白膜，這叫做第三眼瞼。
Ocular tumors in dogs are found in the eyelid, conjunctiva, third eyelid, cornea, sclera, iris, ciliary body, retina, choroid, optic nerve, and orbit.
犬類的眼部腫瘤發現於眼瞼,結膜,第三眼瞼,角膜,鞏膜,虹膜,睫狀躰,眡網膜,脈絡膜,眡神經和眼眶。
Signs include enophthalmos (sunken eye), miosis (small pupil), elevated third eyelid, and ptosis (drooping of the upper eyelid).
症狀包括眼球內陷、瞳孔縮小、第三眼瞼上移和上眼瞼下垂。
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.
衹有一種一直的霛長類動物還保存著第三眼瞼的功能，就是生活在西非的金熊猴（跟狐猴是近親）。