In a recent paper*, Mr Stark and his co-authors investigate internal migration instead.
在近期的报告里，斯达克先生和他的合著者着手调查国内人口的流动情况。
A second source of growth was large-scale internal migration, mainly from south to north.
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.
第二个增长动力来自大规模的国内迁移，主要是从南向北。
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