rimrock

例句：

1. 1. The rimrock of the mountain is a natural wonder.
   山的岩层是大自然的奇观。
2. 2.The geologist studied the rimrock to understand the history of the area.
   地质学家研究岩层以了解该地区的历史。
3. 3.The rimrock is home to many rare species of plants and animals.
   岩层是许多稀有植物和动物的家园。