high-frequency hardening machine

例句：

1. 1.This high-frequency hardening machine is used for the surface treatment of metal parts.
   这种高频硬化机用于金属零件的表面处理。
2. 2.The manufacturer claims that the high-frequency hardening machine can improve the surface quality of the workpiece.
   制造商声称，高频硬化机可以提高工件的表面质量。
3. 3. The high-frequency hardening machine has a wide range of applications in the manufacturing industry.
   高频硬化机在制造业中有广泛的应用。