shellfish

/ˈʃelfɪʃ/
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Shellfish are small creatures that live in the sea and have a shell. 甲壳类水生动物

noun [专属名词] 甲壳类动物;贝类等有壳的水生动物

Fish and shellfish are the specialties. 鱼和甲壳类水生动物是特产。

shell(壳) + fish(鱼) → 甲壳类动物
单词造句:
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Think about where fish and shellfish live. 想想鱼类和贝类所生活的环境。