spinous pocket

例句：

1. 1.The surgeon removed the hard shell of the tumor.
   外科医生将肿瘤的硬壳切除。
2. 2.The scientist found a hard shell inside the egg.
   科学家在蛋里发现了一个硬壳。
3. 3.The crab has a hard shell to protect its soft body.
   螃蟹有硬壳来保护它的软身体。