tempering storage

例句：

1. 1. The steel was tempered to increase its strength and toughness.
   钢材经过退火处理以提高其强度和韧性。
2. 2.During the tempering process, the metal is heated and then cooled rapidly.
   在退火过程中，金属被加热然后迅速冷却。
3. 3. The engineers used a special machine to temper the steel before it was used in the construction.
   工程师们使用一种特殊的机器对钢铁进行退火处理，然后再用于建筑中。