was underlain by
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
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
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