rock shell

例句：

1. 1.The rock shell is a natural barrier that protects the ocean floor from the seabed.
   岩石壳是一个天然的屏障，保护海洋底部免受海底侵蚀。
2. 2. The rock shell is composed of layers of sedimentary rock.
   岩石壳由沉积岩层组成。
3. 3.The rock shell is a geological feature that can be studied to understand the history of the Earth's crust.
   岩石壳是一种地质特征，可以通过研究来了解地球地壳的历史。