hard-burned gypsum

例句：

1. 1.The hard-burned gypsum was used to make the wall.
   硬烧石膏被用来制作墙壁。
2. 2. The builders used hard-burned gypsum for the construction of the building.
   建筑工人使用硬烧石膏来建造这座建筑。
3. 3.The hard-burned gypsum was resistant to water and fire.
   硬烧石膏对水和火都有抗性。