大多数试图解释热木星存在的设想是，它在更远的地方形成，然后向内迁移。

Most attempts to explain a hot Jupiter's existence envision it forming farther away, then migrating inward.

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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.

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但是这样的项目通常限制条件非常严格并仅限于省内迁移的民工。

But such programmes are often tightly restricted and cover workers who have moved from country to town within a province.

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