In the case of population growth this momentum can persist for decades after birthrates drop.
人口增长的这种势头在出生率下降后还可以持续四年.
辞典例句
Eroding religious belief in Europe may partly explain lowered birthrates.
出自-2013年12月阅读原文After the Soviet Union's collapse, says Cherlin, "anxiety for the future" depressed birthrates in Russia and Eastern Europe
出自-2013年12月阅读原文