quenching and tempering

例句：

1. 1. The steel undergoes a process of quenching and tempering before being used in the manufacturing industry.
   这种钢材在制造行业使用前要经过淬火和回火处理。
2. 2. During the quenching and tempering process, the metal is heated to a high temperature andthen quickly cooled to achieve its desired properties.
   淬火和回火过程中，金属被加热到高温，然后迅速冷却以达到所需的性能。
3. 3. The process of quenching and tempering is crucial for the quality and durability of many engineering materials.
   淬火和回火过程对于许多工程材料的质量和耐用性至关重要。