serration hobber

例句：

1. 1. The blade of the knife is serrated for cutting through tough materials.
   这把刀的刀刃是锯齿状的，用来切硬物。
2. 2.The car's body has a serrated design to provide extra grip on slippery roads.
   汽车车身设计有锯齿状，以在湿滑的道路上提供额外的抓地力。
3. 3. The teeth in the saw are serrated, which makes it easier to cut through wood.
   锯片上的牙齿是锯齿状的，这使得它更容易切割木头。