The nation's infant mortality rate has reached a record low.
该国的婴儿死亡率已达历史最低。
In ancient times infant mortality was extremely high.
在古代婴儿死亡率极高。
In ancient times infant mortality was extremely high.
在现代婴儿逝世亡率极高。
Infant mortality is still very high in some countries.
有些国家婴儿死亡率仍很高。
Epidemiology of Infant Mortality II: Person, Place, and Time.
婴儿死亡的流行病学(二)：人，地，时。
If human embryo is person, why we never count these into infant mortality rate?
如果人胚胎是人，为什么我们从不将它们计算在婴儿死亡率内？
If human embryo is person, why we never count these into infant mortality rate?
如果人胚胎是人，为什么我们从不将它们计算在婴儿死亡率内？
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