为了做出更准确的人口预测，人口统计学家必须比现在更多地了解生育率的社会和经济决定因素。
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
医学和科学方面的进展继续迅速推进，但出于众多原因，包括经济和社会因素造成的原因，越来越大比例的世界人口被抛在后面。
Advances in medicine and science continue to race ahead, yet an ever greater proportion of the world's population is left behind for a host of reasons, including those with economic and social causes.
当我们进入现代社会，社会机制对人口的宏观影响，至少在某些方面可能会随着时间的推移，会越来越成为有效的因素。
The gradual increase in time delays for NH population declines as we moved into the modern era may reflect that at least some social mechanisms may becoming more effective over time at the macroscale.
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