虹膜眼睛中一层带色素的，球形的可伸缩的薄膜，处于。
The pigmented, round, contractile membrane of the eye, suspended between the.
虹膜眼睛中一层带色素的，球形的可伸缩的薄膜，处于角膜和晶状体之间，为。
The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.
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