削尖

例句：

1. 1.He sharpened his knife with a stone.
   他用石头磨快了他的刀。
2. 2. The carpenter needs to sharpen the saw before starting work.
   木匠需要先磨快锯子才能开始工作。
3. 3. She sharpened her knives for dinner.
   她为晚餐磨快了她的刀。