Researchers compiled a composite index of "water threats" that includes issues such as scarcity and pollution.
研究人员编制了“水威胁”综合指数，其中包括水短缺和污染之类的问题。
Composite index analysis is based on the relative concentration of quality components in its environmental quality standards to judge the pollution levels of the water-quality status.
水环境质量评价指数法是根据水质组分浓度相对于其环境质量标准的大小来判断水的质量状况。
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