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An eyelid-like structure of translucent or transparent skin protecting part or all of the eye of certain fishes.
Mid 19th century; earliest use found in Annals and Magazine of Natural History.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。