以下为句子列表：
英文: Understanding the water cycle, natural water purification, water quality, and water conservation. Design of ecological systems for water supply: gravity feed water systems, hydroelectric systems, rainwater harvesting.
中文: 描述:这个板块介绍了水循环，自然水净化作用，谁的质量和节约用水；介绍了经济供水系统的设计，雨水灌溉系统的设计。
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