The Age of Migration 迁移时代
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The wage gap between rich and poor countries is far wider than it was a century ago, during the great age of migration from Europe to America.
ECONOMIST: Migration
The line marked old age structure assumes net migration of 140, 000 but with higher life expectancy and lower fertility.
BBC: England and Wales population up
Young age structure combines high migration with lower life expectancy and higher fertility.
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