barium sulfite

例句：

1. 1. The barium sulfate crystals were used as a lubricant in the machine.
   硫酸钡晶体用作机器的润滑剂。
2. 2. The barium sulfate was dissolved in water to make it easier to use.
   硫酸钡被溶解在水中，使其更容易使用。
3. 3. The barium sulfate crystals were used as a filter in the water purification process.
   硫酸钡晶体用于水处理过程中的过滤。