chitin
noun [ U ] biology specialized uk/ˈkaɪ.tɪn/ us/ˈkaɪ.tən/
壳质（某些生物体表坚硬的保护层，如昆虫、虾，龙虾的外壳和部分真菌的细胞壁）
a hard substance in the outer shell of insects and animals such as shrimp and lobster, and in the cell walls of some fungi
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