annealing process

例句：

1. 1.The steel was heated to a high temperature and then cooled down to anneal it.
   钢铁被加热到高温，然后冷却以退火。
2. 2. During the manufacturing process, the material is subjected to various annealing treatments.
   在制造过程中，材料会经历各种退火处理。
3. 3. The annealing process helps to improve the strength and toughness of the material.
   退火过程有助于提高材料的强度和韧性。