• 1. half lethal time: 半致死时间
• 2. Time of Half Lethal: 半数死亡时间
• 3. The Time of Half Lethal: 死亡时间 | 半数死亡时间

• 1.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。
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