Water from the local river comes from springs and is considered so pure that it is drunk without treatment or filtration.
据说这里河流的水源都是山泉，非常纯净，无需处理或者过滤就可以饮用。
The ease study has proved that partly developing the pure well irrigation is necessary, reasonable and successful in the Yellow River irrigation districts.
该文通过系统地分析研究，证明在引黄灌区内部分区域开展纯井灌是必要的、合理的、成功的。
It is like the sea, receiving the dirty river and remaining pure.
就像大海，接纳浑浊的河流，同时保持清澈。
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