lime rock

例句：

1. 1.The limestone cliffs are a popular destination for hikers.
   石灰岩悬崖是徒步旅行者的热门目的地。
2. 2. The limestone formations in this area have been formed over millions of years.
   这个地区的石灰岩形成于数百万年。
3. 3. The limestone caves are home to many species of colorful insects.
   石灰岩洞穴居住着许多色彩斑斓的昆虫物种。