无水钾镁矾

例句：

1. 1. Thisfertilizer is made from the mineralmagnesium sulfate.
   这种肥料是由硫酸镁制成的。
2. 2. Thechemical reaction between the twosubstances produces ammoniagas.
   这两种物质之间的化学反应产生氨气。
3. 3. The process of purifying water involvesremoving impurities such as salt andminerals.
   净化水的过程包括去除盐和矿物质等杂质。