Nonstop waves of immigrants played a role, too and so did bigger crops of babies as yesterday's “baby boom” generation reached its child-bearing years.
Nonstop waves of immigrants played a role, too and so did bigger crops of babies as yesterday's “baby boom” generation reached its child-bearing years.
译文：不间断的移民浪潮也起了作用——而且随着昔日在“生育高峰期”出生的一代人达到生育年龄，婴儿的出生数量增加了，这同样起了作用。