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GRE阅读考试难句解读(六).

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  38.Some geologists,however,on the basis of observations concerningmantle xenoliths,argue that the mantle is not layered,but thatheterogeneity is created by fluids rich in “incompatible elements”(elements tending toward liquid rather than solid state)percolatingupward and transforming portions of the uppermantle irregularly,according to the vagaries of the fluids&apos pathways.

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