twofold dilution的用法和样例：
例句
- Methods The MIC and MBC of LVLX were determined by the tube doubling dilution method, and the effectiveness of the drugs were assessed by half survival time of the mice.
方法采用二倍稀释法测定最低抑菌浓度和最低杀菌浓度，以半数动物存活时间为指标比较药物对实验性结核病的疗效。 - Inhibition effect of several dialkyl quaternary ammonium salts on aquatic pathogenic bacteria was tested by double dilution method in tubes.
用试管两倍稀释法比较了几种双烷基季铵盐抑制水产动物病原菌生长的实验。
