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。

youdao

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。

youdao

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。

youdao

Now it has escaped into the freedom of low fertility and low mortality.

ECONOMIST: Declining populations

Humanity was once caught in the trap of high fertility and high mortality.

ECONOMIST: Declining populations

Senegal, Ethiopia and Ghana all reduced fertility and child mortality a lot.

ECONOMIST: African child mortality