目前欧盟国家的妇女平均生1.5个孩子，而为了保持人口替代率，每个妇女至少要生2个孩子。
At present 1.5 babies are born for every European Union woman, when two births are required for the population "replacement rate" to be maintained.
法国的人口出生率已经达到每个家庭两个孩子，离保持人口数量稳定的“替代率”相差无几。
In France the fertility rate is already around two children per female, not far short of the “replacement rate” which keeps population numbers steady.
世界人口生育率将在2020至2050年期间降至世界生育替代率水平以下。
Sometime between 2020 and 2050 the world's fertility rate will fall below the global replacement rate.
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