1·They infected all three strains of mice with lethal doses of influenza virus.
他们把这三株小鼠全部感染了致死剂量流感病毒。
2·In vertebrates, polyploidy tends to be lethal, but plants can do just fine with all this extra genetic material.
脊椎动物中，多倍体往往是致死的，而多倍体植物却可以很好的存活。
3·now prisoners are executed by lethal injection.
现在的犯人是被注射致死。
4·"This proves the concept that GM-SCF, only in the lung, is sufficient to provide complete protection against infection with otherwise lethal doses of influenza virus strains," said Dr. Shams.
“证明这个概念，GM - SCF，只是在肺，对致死剂量流感病毒感染足以提供完全保护，”Shams博士说。
5·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。