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

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