induction hardening

例句：

1. 1.The steel is induction hardened to improve its strength and toughness.
   这种钢经过感应硬化处理以提高其强度和韧性。
2. 2.Induction hardening is a process used to increase the hardness of metals.
   感应硬化是一种用于提高金属硬度的过程。
3. 3.The engineer explained how induction hardening can be used to create parts with superior mechanical properties.
   这位工程师解释了如何利用感应硬化来制造具有优越机械性能的零件。