开刃

例句：

1. 1. 打开刀刃；2. 使锋利；3. 使
   刀具
2. 1.The chef carefully opened the knife to cut the meat.
   厨师小心翼翼地打开刀切肉。
3. 2.The old man sharpened his axe to make it more effective.
   老人磨快了他的斧头，使其更高效。
4. 3.The carpenter had to edge the saw blade to fit the new piece of wood.
   木匠不得不磨平锯片，以适应新的木材。