nictitating membrane

noun

A transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals.

The nictitating membrane is a transparent third eyelid found in some animals.

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意味（1）

A transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals.

As the wildebeest shrinks, the circle of sated birds lounging in the short grass expands. With bulging crops, the vultures settle their heads atop folded wings and slide their nictitating membranes shut.

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nictitating membrane

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