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。

youdao

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。

youdao

The contents include name, gender, age, nation, nationality, education level, profession, work, migration, social security, marriage, birth, death and housing.

普查登记的主要内容包括：姓名、性别、年龄、民族、国籍、受教育程度、行业、职业、迁移流动、社会保障、婚姻、生育、死亡、住房情况等。

youdao

The wage gap between rich and poor countries is far wider than it was a century ago, during the great age of migration from Europe to America.

ECONOMIST: Migration

The line marked old age structure assumes net migration of 140, 000 but with higher life expectancy and lower fertility.

BBC: England and Wales population up

Young age structure combines high migration with lower life expectancy and higher fertility.

BBC: England and Wales population up