水是人类生存的基本要素。人们的生活离不开水，所以将污水净化为干净的水是一项极其重要的科技进步。
Water is the essential ingredient to human survival. Since people cannot live without water, the ability to convert contaminated water to pure water is an incredibly important scientific achievement.
水是人类生存的基本要素。人们的生活离不开水，所以将污水净化为干净的水是一项极其重要的科技进步。
Water is the essential ingredient to human survival. Since people cannot live without water, the ability to convert contaminated water to pure water is an incredibly important scientific achievement.
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