求翻译：针对问题二，首先，进行总体评价，利用Excel软件，计算出该城区各重金属浓度的平均值、标准差、变异系数等元素含量统计特征，分析数据结果是什么意思？

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In view of the question two, first, carries on the overall appraisal, uses the Excel software, calculates this city various heavy metals density element content statistics characteristics and so on mean value, standard deviation, coefficient of variation, analyzes the data result

For the next question is, first of all, the global assessment, the use of Excel software, calculate the concentrations of heavy metals in urban areas the average, standard deviation, variation coefficient, and other statistical characteristics of elements, analysis of results

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