以下为句子列表：
英文: Surface water supplies, problems and solutions; the small farm dam how to construct one; well drilling the von der Rigg; spring and groundwater protection; urban water supply and sanitation; water vending; roof catchment systems.
中文: 地表水供给的问题与解决方法；如何建造农场小蓄水池；凿井；泉水与地下水的保护；城市供水与卫生设备；水的销售；屋顶排水系统。
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英文: This paper discusses the problem of our urban water supply and suggests some guarantee countermeasures based on exploring new water resources, saving water and enhancing protection.
中文: 本文分析了我国城市供水存在的主要问题,并以开源节流加强保护为原则提出了安全保障对策。
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