海拔, altitude, 重力, gravity, 渗透, seeps, 下坡, downhill, 坡度, slopes, 方向, direction, 最初, initially, 被环绕, surrounded, 水库, reservoir, 必要的, essential, 聚集, congregate, 灌溉, irrigation, 发电, power generation, 市政的, municipal, 废物处理, waste disposal

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