The strong correlations in Fig. 2, A and B, make a second important point: Although fertility and mortality rates tend to be lower in cities, the rates in urban and rural areas remain tied.
图2A和2B显示出这两者存在很大相关性，这说明了另一个很重要的问题：尽管城市的怀孕率和死亡率较低，但是城市和农村地区这两个比率紧密相关。
Humanity was once caught in the trap of high fertility and high mortality.
人类过去掉入高出生率和高死亡率的陷阱，而现在逃到了低出生率和低死亡率的自由之地。
In recent decades, many countries have made progress in reducing maternal mortality and lowering fertility rates.
近几十年来，很多国家在降低孕产妇死亡率和生育率方面均取得了成果。
And even where fertility has fallen, maternal mortality remains unacceptably high in many countries in sub-Saharan Africa and South Asia.
而且即使生育率下降，撒哈拉以南非洲和南亚很多国家的孕产妇死亡率仍然高得令人难以接受。
Vital statistics have helped identify major trends in fertility, child survival and child mortality.
关键统计数据可以帮助我们发现生育率、儿童存活率和死亡率方面的主要趋势。
The comparative health advantage of urban living is also revealed in lower fertility Fig. 2a and infant mortality rates Fig.
此外，低孕率(图2a)和较低婴儿死亡率(图2b)也使城市生活具有一定的健康优势。
These survivors are all the progeny of just two males and four females, and display the lowered fertility and above-average infant mortality that goes with inbreeding.
这些幸存者均由2只雄虎和4只雌虎繁衍而来，繁殖能力明显减退，并且由于近亲繁殖其幼虎死亡率也超出平均水平。
Compared with traditional functions, both the composite fertility model which is based on random distribution functions and the segmented mortality model improved the models 'accuracy.
与传统模型相比，本文所提出的基于随机分布函数的生育率组合模型和死亡率分段模型使模型精度得到了进一步的提高。
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。
There is great impact on infant mortality health, fertility, productivity and a child's academic performance if women are educated.
如果女性受教育，将会对婴儿死亡率，自身生育能力，工作效率和孩子的学业成绩产生很大影响。
There is great impact on infant mortality health, fertility, productivity and a child's academic performance if women are educated.
如果女性受教育，将会对婴儿死亡率，自身生育能力，工作效率和孩子的学业成绩产生很大影响。
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