目前日本的出生率是每个家庭1.21个孩子(要维持人口稳定需要每家庭2.08个孩子)。
Japan has a birth rate of just 1.21 per couple (a rate of 2.08 is needed to maintain a population).
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.
所以，各种分析表明，如果去满足那些没被满足的需要，将大大有助于达到稳定全球人口所需的低出生率。
So if we were to satisfy that unmet need, various analyses show we would go a long way towards achieving the reduction in birth rates that are required to achieve global population stabilization.
人口出生率是指女性一生预期生养的儿童数目；2.1是更替水平，人口在这一点上保持稳定。
The fertility rate is the number of children a woman can expect during her lifetime; 2.1 is the replacement level, the point at which the population stabilises.
2050年将世界人口稳定在80亿或80亿以下。通过自发主动减少出生率，将改变人口以现在的增长速度在本世纪中叶突破90亿的推测。
Stabilization of the world population at 8 billion or below by 2050, through a voluntary reduction of fertility rates, rather than the current trajectory of more than 9 billion by midcentury
2050年将世界人口稳定在80亿或80亿以下。通过自发主动减少出生率，将改变人口以现在的增长速度在本世纪中叶突破90亿的推测。
Stabilization of the world population at 8 billion or below by 2050, through a voluntary reduction of fertility rates, rather than the current trajectory of more than 9 billion by midcentury
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