blade of variable cross-section

例句：

1. 1. The chef used a sharp blade to cut the vegetables.
   厨师用一把锋利的刀片切蔬菜。
2. 2. The carpenter carefully sharpened the blade of his saw.
   木匠小心地磨利了锯子的刀片。
3. 3. The doctor needed to remove the broken blade from the patient's arm.
   医生需要从病人的手臂上取出断裂的刀片。