防护层

• inoxidizing coating
• protective covering

参考释义

防护层

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例句

1. 防御器官动物或植物的防护层，结构或器官，如牙齿，爪子，荆棘或乌龟的壳
   A protective covering, structure, or organ of an animal or a plant, such as teeth, claws, thorns, or the shell of a turtle.