Demographers are perhaps best known for making population projections. 人口学家或许在人口预测上最为知名。
Cohort-component method is widely used in actual population forecasts, which is base on population component and demology principle. 在现实的人口预测中，根据人口本身变动要素和人口学原理的队列要素法应用比较广泛，效果良好。
