求翻译：从变异系数分析，Cr,Cu,Hg,Zn的变异系数均大于1，说明这三种金属元素受人为因素很大，人为活动对土壤造成了严重的污染，特别是Cu,Hg,其变异系数远大于1，该城区应着重控制这几种金属的污染源。是什么意思？

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From the coefficient of variation analysis, the Cr, Cu, Hg, Zn coefficient of variation is bigger than 1, explained these three metallic element is been very big the human factor, the artificial activity has caused the serious pollution to the soil, specially Cu, Hg, its coefficient of variation far

From analysis on the variation coefficient, Cr,Cu,Hg,Zn coefficient of variation is greater than 1, illustrate three kinds of metal elements affected by man-made factors are large, causing serious pollution human activities on soil, especially Cu,Hg, coefficient of variation of the much larger than

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