求翻译：3、根据两年的取样样本数据，分析铝含量的变化，绘制出这两年来的铝含量和其他污染物含量的变化，其中蓝色的表示铝含量的变化，如图3.2铝含量的变化所示。是什么意思？

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3, based on two years of sample data, analysis aluminum content of the change, and draw the two years of aluminum and other levels of pollutants, blue indicates that aluminum changes, such as figure 3.2 aluminum indicated by the changes.

3rd, acts according to two year sample sample data, the analysis aluminum content change, draws up these for two year aluminum content and other pollutant content change, in which blue color expression aluminum content change, like Figure 3.2 aluminum content change shows.

3, based on two years of sampling data to analyze the change of aluminum content, draw out the two years of the change of aluminum and other contaminants, where Blue represents the change of aluminum content, as shown in Figure 3.2, the change of aluminum.

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