serated fracture

例句：

1. 1.The rock is serrated on the edges.
   这块岩石边缘有锯齿状。
2. 2.The tree has serrated leaves.
   这棵树有锯齿状的叶子。
3. 3. The river is serrated with rocks.
   这条河有石头的锯齿状。