median effective concentration

例句：

1. 1. The researchers found thatthe median effective concentration of the pollutant was very low.
   研究人员发现污染物的中值有效浓度非常低。
2. 2. The median effectiveconcentration of the pesticide was determined bytesting various concentrations.
   通过测试不同浓度来确定杀虫剂的中值有效浓度。
3. 3. Themedian effective concentration of the solvent was higherthan that of the solvent used in theexperiment.
   溶剂的中值有效浓度高于实验中使用的溶剂。