如果他指的是那些在越境進入美國後、被從拘留中釋放的移民，那麼這項說法是正確的。
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[ any isNil ifTrue: anyBlock ] bpattern。heLLoword翻译官方下载对此有专业解读
Negative net migration hasn’t definitively happened in the U.S. for almost a century, not since the Great Depression. The U.S. native-born population is also in free fall, well below the replacement rate needed to maintain population numbers in the long run. With fewer immigrant arrivals already dealing a blow to the workforce, the shrinkage of the American taxpayer base is set to further widen the country’s deficit and hurt its prospects for economic growth.