critical killing concentration

例句：

1. 1. The military is working todevelop a critical killing concentration for the newweapon.
   军方正在努力开发一种新的武器的临界杀伤浓度。
2. 2. The research team has identifieda critical concentration of pollutants inthe area.
   研究小组已经确定了该地区污染物的临界浓度。
3. 3. The scientist found that the criticalconcentration for the chemical reaction was at avery low level.
   科学家发现化学反应的临界浓度非常低。