tempering

例句：

1. 2.
   金属
2. 3.
   烹饪
3. 1. The chef is experimenting with new techniques for tempering the steaks.
   厨师正在尝试新的技术来对牛排进行回火。
4. 2. The metal was tempered to increase its strength and hardness.
   金属被回火以提高其强度和硬度。
5. 3. In cooking, tempering refers to the process of adding oil or fat to the pan before heating it.
   在烹饪中，“调质”是指将油或脂肪添加到平底锅之前加热的过程。