This relatively huge increase has caught many demographers by surprise.

这种颇为可观的增加量使得许多人口统计学家感到很惊讶。

Selectivity of human migration long been the focus of demographers and economists.

人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点。

Some Chinese demographers worry that the country will get old before getting rich.

一些中国人口专家担忧届时可能面临未富先老的问题。

Selectivity of human migration has long been the focus of demographers and economists.

人口迁移的选择性一直以来都是人口学家和经济学家关注的焦点。

Demographers reckon that at least three-quarters of Egyptians actually live in urban areas.

人口统计学家认为，至少有四分之三的埃及人实际上是生活在城市。

Demographers reckon that at least three - quarters of Egyptians actually live in urban areas.

人口统计学家认为,至少有四分之三的埃及人实际上是生活在城市.

Demographers also expect strains on the household registration system, which restricts internal migration.

人口统计学家同时预测阻碍国内移民的户籍制度将受到压力.

Demographers also expect strains on the household registration system , which restricts internal migration.

人口统计学家同时预测阻碍国内移民的户籍制度将受到压力。

Demographers believe that the independence of modern Chinese women is one of the main causes of the growing unmarried population.

人口学家们认为，现代中国女性的独立是未婚人口不断增长的主要原因。

Sociologists and demographers have discovered that couples who have at least one son face significantly less risk of divorce than couples who have only daughters.

社会学家和人口学家发现，有至少一个儿子的夫妇比那些只有女儿的家庭面对的离婚风险要小得多。