impaired condition meaning in English
恶化条件
Examples
- Two methods were used to provide water quality ratings in bio - assessment using biotic index ( bi ) , ( 1 ) using the sampled sites meet the criteria for undisturbed and minimally impaired conditions , the confidence in the distribution of bi value for the 75th percentile to be used as the criterion dividing " unimpaired " form " impaired " . any values below the 75th percentile were considered as " excellent " , and values above the 75th percentile , was quadrisected for different water quality ratings
采用两种方法研究m指数划分水质级别的标准： （ 1 ）无污染样点的m指数值法，以75分位数值作为最清洁水质标准，将高于此值的可能分布范围一等分，分别代表不同的水质级别zk ）所有样点（污染与无污染样点）的bi指数值法，以5分位数值作为最清洁水质的标准，将高于此值的可能分布范围4等分，分别代表不同的水质级别。