high-frequency hardening

例句：

1. 1. The steel is subjected to high-frequency hardening to improve its wear resistance.
   钢材经过高频硬化以提高其耐磨性。
2. 2. In the manufacturing process, high-frequency hardening is used to achieve precise dimensions.
   在制造过程中，高频硬化用于实现精确尺寸。
3. 3. The engineers use high-frequency hardening techniques to enhance the strength and durability of the components.
   工程师们使用高频硬化技术来增强零件的强度和耐用性。