half lethal concentration的意思|示意

For copper, she said, the LC50 (the concentration lethal to half of any given species over a certain time) decreases with temperature - meaning that toxicity increases.

她说，对于铜来说，半数致死浓度lc50(一定时间内受试动物半数死亡的毒物浓度)随温度减弱-这就意味着毒性增加。

Through experiments have found that: when the concentration of heavy metals in the soil is 0.5 percentages, it fits the half lethal dose.

通过实验发现：当土壤中重金属的含量为0.5%时，最符合蚯蚓的半数致死量。