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。

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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。

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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。

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Novy-Hildesley explains, the doctor faced a high rate of infant mortality in the clinic.

VOA: standard.2009.12.18

In Roman times the average life span was just 22 (mainly because of the appalling rate of infant mortality), by 1800 it was 40 years, 1900 around the late 40s and today it hovers around the mid-to-late 70s.

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And in one of the most deprived areas of Maharashtra in India the infant mortality rate fell by 60% over a three year period during which mothers were trained as baby monitors.

BBC: Baby deaths 'could be halved'

Despite the trappings of Westernization in major cities, a literacy rate of just 61 percent and high infant mortality rates betray the reality of India's status as an emerging nation.

CNN: India reaps benefits of economic boom