water hardness ions

例句：

1. 1.The water hardness in the lake is high, which affects the fish's growth.
   湖里的水硬度很高，这对鱼的生长有影响。
2. 2. The water hardness ions in the soil can affect plant growth.
   土壤中的水硬度离子会影响植物生长。
3. 3.The water hardness ions in the tap water are not suitable for drinking.
   自来水中的水硬度离子不适合饮用。