渗漏 Seepage
凤眼蓝 Water hyacinth
水污染 Water pollution
水的盐化 Water salination
饮用水供应 Drinking water supply
脱盐 Desalination
饮用水 Drinking water
饮用水处理 Drinking water treatment
城市配水系统 Municipal water distribution systems
农村供水 Rural water supply
污水处理厂 Sewage treatment plants
水泵 Water pumps
水处理 Water treatment
水井 Water wells
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