这片金属的边缘呈锯齿状，小心别割伤自己。

The edge of this metal piece is ___saw-toothed, so be careful not to cut yourself.

这条山脉呈现出锯齿状轮廓，高低起伏非常明显。

The mountain range has a ___saw-toothed outline with sharp rises and falls.