There are not enough native-born workers in these countries so they must recruit workers from other countries.
这些国家没有足够的本土工人，所以他们必须从其他国家招聘工人。
2
In America, a one-percentage point increase in the proportion of immigrants in the population made the native-born 0.05% better off.
在美国，移民在人口中所占比例每增加一个百分点，本土出生的人口生活水平就会提高0.05%。
3
A one-point rise in immigration made the native-born slightly worse off in Austria, Belgium, Germany, Luxembourg, the Netherlands, Sweden and Switzerland.