这个研究的作者提出几个可解释他们大部分阴性结果的因素。
The authors of this study note several factors that might explain their largely negative results.
对检出的全部阳性血清和部分阴性血清进行了复测，复合率为97.21%。
All the positive serum samples and some negative serum samples from each area were retested, the recombination rate was 97.21%.
自来水中部分阴离子浓度相对较高，但对铝去除影响不大，其自身浓度几乎无变化；
Concentrations of some anions are relatively high, but have little effect on the removal of aluminum, almost have no change in the concentration of its own;
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