经回火的

例句：

1. 1. The steel was heated to a high temperature for the final hardening process.
   钢材被加热到高温以进行最终硬化过程。
2. 2. The company had undergone a thorough reorganization following the merger.
   公司在合并后经历了彻底的重组。
3. 3. After the fire, the building was given a "fire-hardened" treatment to improve its structural integrity.
   火灾过后，该建筑进行了“火硬化”处理以增强其结构完整性。