country rock

• 围岩

country rock的用法和样例：

例句

1. It is possible to use Gurit without damaging the surrounding rock.
   使用古力特炸药将完全可能不造成对围岩的破坏。
2. The classification of rock masses is in the base of tunnel design and construction.
   隧道围岩地质类别的判别是进行隧道支护和施工的基础。