As their numbers in the wild keep falling, Germany's stable population offers hope.

随着野生熊猫数量持续下降，德国稳定的数量给我们带来了希望。

As recently as 2010, the birth rate to New Zealand was still 2.1 children per woman on average precisely at the level required to keep the population stable.

就在 2010 年，新西兰的出生率仍然是平均每个妇女 2.1 个孩子，正好达到保持人口稳定所需的水平。

The fertility rate or the average number of children born to a woman in her lifetime was around 1.25, far below the minimum rate of 2.07 considered essential for a stable population.

生育率或妇女一生平均生育子女数约为 1.25 个，远低于被认为对稳定人口至关重要的最低生育率 2.07 个。

Social scientists use a model of demographic transition to explain that the process of moving from a young, growing population to an older, stable population is tied to the economic and technological development ofa society.

社会科学家使用人口转变模型来解释从年轻的、不断增长的人口转变为年长的、稳定的人口的过程与社会的经济和技术发展密切相关。