Estimates for the life of the Nubiansandstone aquifer range from a century to a millennium.
学者们对努比亚砂岩含水层寿命的估计相差悬疏，从一百年到一千年不等。
2
Scientists estimate that there is an equivalent of 200 years of water flowing down the Nile in the NubianSandstone Aquifer.
科学家估计，有相当于200年的水流沿尼罗河的砂岩含水层努比亚。
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The NubianSandstone Aquifer System, the world's largest, is located under the eastern part of the Sahara desert and spans the political boundaries of Libya, Chad, Sudan and Egypt.