化学需氧量(简称COD)是水质污染程度的代表性指标。
Chemical Oxygen Demand (COD) is the representative index of sewage water.
原生动物存在于各种污染水体，利用其作为指示生物判断水质污染程度，利用其机能净化污水。
Protozoa exits in various wastewater, by whose biological indicator and mechanism we can determine the degree of polluted water and cleanse the wastewater.
本文就是根据地下水的诸多杂质含量的实测数据，用模糊数学的方法评价地下水的污染程度，判定水质等级的一种尝试。
Based on the measured contents of multiple impurities of groundwater, this paper attempts to use fuzzy mathematical method to evaluate the pollution of groundwater and to determine the water quality.
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