英语词汇“third eyelid”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	third eyelid
释义	third eyelid noun Informal term for nictitating membrane.Crocodilians' eyes are immobile spheres covered by three eyelids: the third eyelid, the nictitating membrane, is transparent, but protects the eye from water.... Eversion of the nictitating membrane is a condition in which the third eyelid protrudes. These membranes, essentially a third eyelid, can cover the exposed portion of the eye, since, as in all sharks, the upper and lower eyelids of catsharks cannot completely cover the eyeball.
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