If these indirect benefits do matter, it may explain why Mr Prasad and company failed three years ago to prove a link between the migration of capital and growth.

如果这些间接好处十分重要，那么也就能解释为什么3年前普拉萨德先生和其同事没能证明资本迁移和经济增长之间的关系了。

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The International Organisation for Migration says it's planning an operation to evacuate thousands of foreigners from the Libyan capital Tripoli as fighting gets closer to the city.

国际移民组织称，随着战事越来越接近利比亚首都的黎波里，他们正在执行一项疏散这座城市的数千名外国人的行动。

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Migration narrows the gap in human capital among the cities, especially the gap between Shanghai and the other 15 cities of the Yangtze River Delta.

研究还发现，就业迁移导致长三角人力资本城际差异缩小，尤以上海与其他15城市的差距缩小更为明显。

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If these indirect benefits do matter, it may explain why Mr Prasad and company failed three years ago to prove a link between the migration of capital and growth.

ECONOMIST: Economics focus

In a study of 127 developing countries in 2009, the prospect of migration boosted human capital, rather than draining it.

ECONOMIST: The medical workforce

Born in the capital of the old Confederacy, brought north by her parents as part of that great migration, Dr. Height was raised in another age, in a different America, beyond the experience of many.

WHITEHOUSE: Remembering Dr. Dorothy Height