与前一个示例一样，使用fn：distinct - values函数避免重复出现同一类别中的购买。
As in the last example, we use the fn: distinct-values function to avoid duplicate purchases in the same category.
结果中国各地区男女性5 0岁以上人口年龄别死亡率都可用一简单数学函数来表示。
Results The age Specific mortality at age 50 and over can be expressed a single function of age x both in all China or various areas of China.
结果中国各地区男女性5 0岁以上人口年龄别死亡率都可用一简单数学函数来表示。
Results The age Specific mortality at age 50 and over can be expressed a single function of age x both in all China or various areas of China.
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