minimum lethal concentration

例句：

1. 1.The study found that the minimum lethal concentration of a chemical is critical for safety.
   研究发现，化学物质的最低致死浓度对于安全至关重要。
2. 2.The manufacturer has set the minimum lethal concentration at 0.5%.
   制造商已将最低致死浓度设定为0.5%。
3. 3.The research team conducted experiments to determine the minimum lethal concentration of the substance.
   研究团队进行了实验，以确定该物质的最低致死浓度。