America is the only rich country that, having fallen below the replacement rate, has risen back above it.

美国是发达国家里唯一一个先是跌破更替生育率，后又反弹超出的国家。

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In Japan, for instance, birth rates fell below the replacement rate of 2.1 children per woman in the mid-1970s and have been particularly low in the past 15 years.

比如在日本七十年代中期，出生率降至相当于平均每个妇女生2.1个孩子以下，而且在过去的15年里一直明显的偏低。

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the fertility rate of half the world is now 2.1 or less—the magic number that is consistent with a stable population and is usually called “the replacement rate of fertility”.

世界上一半的地区，生育率仅为2.1%，甚至更低。 这一比率通常被称作“生育替代率”，标志着人口数量的稳定。

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The last time it was above the replacement rate of two was in 1976.

BBC: Singapore uses rap to try to boost birth rate

Western European countries have low fertility rates, below the replacement rate of 2.1.

FORBES: Warning Bell for Developed Countries: Declining Birth Rates

Africa has even higher TFRs, with many of its countries between 4 and 7, far higher than the replacement rate of 2.1.

FORBES: Declining Populations Make Peaceful Neighbors