1、
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.
词典精选例句
2、
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。
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