What is the meaning of tempering? What is the meaning of tempering?

1. Re-melt the metal in the furnace. Such as: scrap iron returning to the furnace.

2. refers to baking cakes again.

3. It is a metaphor to repeat what you have done in the past.

4, especially rework and "complete" rework.

5. It refers to the driver who needs to go back to the driving school to retake subject 1 after the driver's license is deducted 12 points.