striated rock surface

例句：

1. 1. The cliffis covered in a layer of smooth,striated rock.
   悬崖上覆盖着一层光滑、有条纹的岩石。
2. 2. The geologist found the striated rock to bean indicator of ancient volcanic activity.
   地质学家发现有条纹的岩石是古代火山活动的指标。
3. 3. The striated rockwas used as a building material for centuries.
   这种有条纹的岩石被用作建筑材料几个世纪了。