柯林斯词典chitin /ˈkaɪtɪn/ 1. N a polysaccharide that is the principal component of the exoskeletons of arthropods and of the bodies of fungi 几丁质 返回 chitin剑桥词典a hard substance in the outer shell of insects and animals such as shrimp and lobster , and in the cell walls of some fungi 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） 返回 chitin