自然死亡率
natural mortality rate
instantaneous rate of natural mortality
natural mortality
natural mortatity
自然死亡系数
instantaneous rate of natural mortality
线描自然率真
natural and lifelike line drawing
纠缠突然死亡与突然产生
entanglement sudden death and sudden birth
4周死亡率
mortality rate in fourth weeks
5岁以下儿童死亡率
Under 5 Mortality Rate
Child under 5 years old mortality rate
Child Mortality under age 5 years old