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was underlain by

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was underlain by
In the early twentieth century,however,it was discovered that much of the High Plains was underlain by a huge aquifer (a rock layer containing large quantities of groundwater).这句话怎么理解啊
was underlain by
20世纪早期,人们发现大部分的高平原地区之下存在巨大的含水土层(含有大量地下水的岩层)