pure water

例句：

1. 1.We need to drink pure water to stay healthy.
   我们需要喝纯净水来保持健康。
2. 2.The city has a lot of clean water sources.
   这个城市有很多干净的水源。
3. 3. The farmer used pure water to irrigate his crops.
   农民用纯净水灌溉他的庄稼。