He profiles soil samples from the past 200 years and extrapolates concentrations of heavy metals and foreign substances into a future without industrial inputs.
他研究了过去200年间的泥土样本并预测，重金属和杂质的集聚物会留到没有工业投入的未来。
The heavy metals were irregularly distributed in soil profiles.
重金属在土壤剖面分布没有规律性；
Analytical results show that the heavy metals are varied with soil profiles.
结果表明，重金属元素随土壤质地不同而有所不同。
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