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单词 nictitating membrane
释义

WordReference Random House Unabridged Dictionary of American English © 2024
nictitating membrane, 
  1. Zoologya thin membrane, or inner or third eyelid, present in many animals, capable of being drawn across the eyeball, as for protection.
  • nictate + -ing2 1705–15

Collins Concise English Dictionary © HarperCollins Publishers::
nictitating membrane /ˈnɪktɪˌteɪtɪŋ/ n
  1. (in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eye
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