And although migration is the only thing which prevents many European populations from shrinking, an influx of outsiders will not change age-structures by much.
虽然吸取移民是唯一的可以阻止欧洲人口缩减的方法，但是流入的外来移民不会对年龄结构产生很大的改变。
2
The average quantities, average rate of age spcific migration and average age specific population in the four years from 1985 to 1989 can be estimated by using this method.
据此方法可得出1985年到1989年四年间平均按龄迁移量、平均按龄人口数及平均按龄迁移率。
3
The contents include name, gender, age, nation, nationality, education level, profession, work, migration, social security, marriage, birth, death and housing.