groundwater, 地下水, depth, 深度, saturated, 饱和的, river bank, 河岸, layer, 层, seepage, 渗流, water-bearing layers, 含水层, driveway, 车道, diagram, 示意图, unsaturated, 未饱和的, exist, 存在, horizontal, 水平的, beneath, 在……之下, vertically, 垂直地, exposed, 暴露的, attributed, 归因于, drought, 干旱

Part 3

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