短语词组短语lethality rate 致死率;称为致死率balanced lethality 平衡致死率relative lethality 相对致死度lethality radiation 辐射致命率lethality y 致死率;死亡率lethality curve 致死率曲线lethality test 致死试验Lethality function 威胁度函数susceptible lethality 敏感致死 返回 lethality