purifying method

例句：

1. 1.The water in the lake is very clean and clear.
   湖里的水非常干净清澈。
2. 2.The air in this area is very purifying.
   这个地区的空气非常清新。
3. 3. The process of purifying the water is essential for our health.
   净化水的过程对我们的健康至关重要。