The census bureau says birthrates have dropped in every area of the world except africa .
人口普查局说，除了非洲之外，世界各地的出生率近来已有所下降。
Judaism , the first faith to crack christian hegemony is today deeply rooted in the u.s. , although it is being eroded by secularization , low birthrates and high levels of inter-marriage .
But the rapid growth of the hispanic population isn 't just due to higher birthrates : minority women also are younger on average , so more of them are in childbearing years .
Birthrates have been plummeting - faster in fact than in other developed country - even as the number of older citizens is soaring .
出生率持续下跌，事实上，比其他发达国家下跌得更快另一方面，老年人的数量却猛增。
In europe , declining birthrates and rising sentiment against immigration point toward a population that will shrink by as much as 100 million people by 2050 .
