the rate of infant mortality

The vast improvements made in the field of medicine have served to lengthen our life expectancy and to reduce the rate of infant mortality.

医学领域的大进步延长了我们的寿命，降低了婴儿死亡率。

In the late 1970s, the infant mortality rate for the children of illiterate mothers was around 110 deaths per thousand live births.

在1970年代后期，在文盲母亲所生的孩子中，婴儿死亡率约为每1000名活胎婴儿中有110个夭折。

They chose several widely-measured and well-studied indices on which to base their index: GDP per capita, life expectancy at birth, infant mortality rate and the incidence of tuberculosis.

他们选择用于编制生活质量指数的，是四个被广泛测量并得到充分研究的指数：人均GDP、出生时的预期寿命、婴儿死亡率以及肺结核病的发病率。