helcoderm atcus spine

例句：

1. 1.The sea cucumber's spine is a unique feature of its body.
   海胆的刺状脊椎骨是其身体的独特特征。
2. 2.The spine of the sea cucumber is used for protection and defense.
   海胆的刺状脊椎骨用于保护和防御。
3. 3.The spine of the sea cucumber is also used as food by some species.
   海胆的刺状脊椎骨也由某些物种作为食物。