serrated shaft

例句：

1. 1. The machine's serrated shaft is designed to grip the material easily.
   这台机器的锯齿状轴设计用来轻松抓住材料。
2. 2. The car's serrated shaft is made of high-quality steel.
   这辆汽车的锯齿状轴是由优质钢材制成的。
3. 3. The tool's serrated shaft is sharp enough to cut through even the toughest materials.
   这个工具的锯齿状轴足够锋利，可以切割最坚硬的材料。