reactivity ratio

例句：

1. 1.The new drug has a high reactivity ratio for the target cells.
   这种新药对目标细胞具有很高的反应活性比。
2. 2. The researchers found that the reactivity ratio of the sample was 0.85.
   研究人员发现样本的反应活性比为0.85。
3. 3. The reactivity ratio is an important factor in determining the effectiveness of a chemical reaction.
   反应活性比是决定化学反应有效性的一个重要因素。