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- By the changes of chlorophyll content, the lethal concentration of Hg to Egeria najas was 0.10-2.00mg/L. 处理48h以后，Hg~(2+)浓度人于1.;00mg/L实验组中的叶片褪绿严重而且叶片相互粘连，叶片叶绿素含量明显低于对照组，从中可以粗略看出Hg(2-)对细叶蜈蚣草的致死浓度为0
- By the changes of the activity of SOD and CAT, the lethal concentration of Hg to Egeria najas was 0.10-1.00mg/L. 以SOD和CAT活性变化为根据，可以推断Hg~(2+)对细叶蜈蚣草的致死浓度为0.;10-1
- Pretreatment of low temperature could induce resistance to lethal concentration of H2O2. 低温预处理可以诱导对致死浓度H2O2的抗性。
- There is negative correlation between lethal concentration 50%(LC50) of the leachate and COD. 渗滤液的半致死浓度(LC50)与COD呈负相关,其常规理化指标并不能完全反映渗滤液在环境中的生物毒性;
- And the values of 48 h median lethal concentration ( LC 50 ) and safe concentration ( SC ) of methamidophos for European eel larvae were 35.9 mg/L and 3.6 mg/L respectively. 甲胺磷乳剂对欧洲鳗仔鳗的半致死浓度（48h－LC50）为35.;9mg/L，安全浓度（SC）为3
- At the treatment of the sublethal dosage and median lethal concentration, the comparison between the life of female and male adult and the ck was non significant or they could be prolonged. 结果显示：高浓度下，寿命缩短；
- ALC = approximate lethal concentration 接近致死浓度
- lethal concentration low (LC LO) 最低致死浓度
- minimum lethal concentration (MLC) 最小致死浓度
- lowest published lethal concentration 公布的最低致死浓度
- median lethal concentration ( LD50 ) 半致死浓度
- median lethal concentration (LC50) LC50
- median lethal concentration(LC50) 半致死浓度（LC50）
- medium lethal concentration (LCso) 半致死质量浓度
- approximate lethal concentration 接近致死浓度
- The probabilities of death, coma were analyzed with Bliss method and their linear regressive equations of probit were obtained respectively, their 50% lethal concentrations(LC50) and 50% coma concentrations(CC50) were calculated by the formulas above. 采用 Bliss法，计算其死亡率和昏迷率的加权直线回归方程，并获得其经救治后血液半数致死浓度 LC50、半数致昏迷浓度 CC50。
- Pot-holes can be lethal for the unwary cyclist. 路上的坑坑洼洼骑车的人一不小心就有致命危险。
- His area of concentration is nuclear physics. 他的专门研究范围是原子物理学。
- The drug affects one's power(s) of concentration. 这种药影响人精神不能集中。
