A protective covering, structure, or organ of an animal or a plant, such as teeth, claws, thorns, or the shell of a turtle.
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。
Horizontal layer structure of turtle grain stone, ravines crossbar, vistas of picturesque YouChang.
横层结构的龟纹石则沟壑纵横、逶迤连绵，意韵幽长。
Horizontal layer structure of turtle grain stone, ravines crossbar, vistas of picturesque YouChang.
横层结构的龟纹石则沟壑纵横、逶迤连绵，意韵幽长。
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