The effects are complex, affected by socio-economic factors, health-service provision, emotional support and other more physiological mechanisms.
2
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.
3
你们说社会经济因素，但是我说，这可能是基因因素。
You say socio economic factor but I am suggesting it could be genetic factors.
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