immigration waves的用法和樣例：
例句
- The most recent large-scale wave of immigration has produced only first- or second-generation Americans.
然而從最近一次大規模移民潮至今，還只有第一和第二代移民。 - By increasing the supply of skilled workers, such immigration would also reduce the widened earnings gap between more and less skilled workers.
由于增加了技術(shù)人才的供應，此種移民潮又可以拉近因技能原因造成的勞動(dòng)力之間的收入差距。
