the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball
sclera的用法和樣例：
例句
用作名詞 (n.)
Sclera was normal sclera porcelain white, yellow dye found in the sclera jaundice. 鞏膜正常鞏膜呈瓷白色，鞏膜黃染多見於黃疸。
Histological evidence showed the sclera of diathermy area was thinner than the normal sclera, but the cryotherapy was not. 由病理組織切片，我們發現電氣燒灼術后之鞏膜很明顯地比臨近的正常鞏膜為薄，而冷凍療法則並無差異。
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