granitic rock

例句：

1. 1.The mountain is covered in a thick layer of granitic rocks.
   这座山被厚厚的一层花岗岩覆盖。
2. 2. Granitic rocks are often used as building materials due to their durability.
   由于其耐用性，花岗岩常被用作建筑材料。
3. 3. The ancient city was built on top of a granitic rock formation.
   这个古老的城市建在一座花岗岩石构造上。