求翻译：由于本问题为一个多因子评价问题，要分析重金属污染的主要原因，必须确定影响该区域污染程度的主要重金属，而主成分的确定，不得不提主成分分析法来客观反应造成该区域重金属污染的主要成分。根据每一成分中解释的变量，分析重金属污染的主要原因。是什么意思？

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Because this question is more than a factor appraisal question, must analyze the heavy metal pollution the primary cause, must determine affects this region pollution degree the main heavy metal, but the principal components determination, can not but propose the principal components analytic method

Because of this problem for a multiple-factor evaluation, analysis of heavy metal pollution of the main reasons, you must determine the effect of main heavy metals pollution in the region, and determination of the principal components, have to increase by principal component analysis of main compone

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