欧洲委员会称凡属于欧盟免签申根区的国家面临有大量移民时应允许临时启动边境检查制度。
The European Commission said that countries inside the European Union's passport-free Schengen area should be allowed temporarily to reimpose border checks when faced with large Numbers of migrants.
我们无法说这个差距在多大程度上取决于移民时的选择，多大程度上取决于移民城市后生育力的下降。
We cannot say how much of the difference is the result of selectivity of migrants at the time of move and how much results from lowered fertility after moving to the urban setting.
他移民去了比利时。
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