第二个增长动力来自大规模的国内迁移，主要是从南向北。

A second source of growth was large-scale internal migration, mainly from south to north.

youdao

第二个增长动力来自大规模的国内迁移，主要是从南向北。

A second source of growth was large-scale internal migration, mainly from south to north.

youdao