Advances in perinatal medicine have reduced infant mortality rates.

围产期医学的进步降低了婴儿死亡率。

Infant mortality is still very high in some countries.

有些国家婴儿死亡率仍很高.

The proletarian infant mortality rate has dropped by 12 percent.

无产阶级的婴儿死亡率下降了12个百分点.

Infant mortality was 20 deaths per thousand live births in 1986.

1986年的婴儿死亡率为生育成活率的千分之二十.

Thus, infant mortality in Palestine refugees is among the lowest in the Near East.

因此,巴勒斯坦难民中的婴儿死亡率在近东地区是最低的。

Develop programmatic approaches and policies to reduce infant mortality rates in a population.

发展计划性的方法与政策以降低人口中的婴儿死亡率.

The life expectancy increased with infant mortality rate and total fertility rate decreased.

随着婴儿死亡率及总和生育率的下降而增加。

The vast majority was de facto slaves , infant mortality huge and poverty extremely wide spread.

绝大多数人是事实上的奴隶，婴儿死亡率高而且贫困极为普遍。

This is important because RSV is currently one of the leading causes of infant mortality worldwide.

这一点很重要，因为RSV目前是全球婴儿死亡率的主要原因之一。

Other experts say that with high infant mortality, only the toughest survived - and the toughest tended to have big heads.

另一些专家用婴儿死亡率来解释。很高的婴儿死亡率只有最顽强者才能生存下来，而这些最顽强者倾向于拥有一颗大脑袋。