birthrates

例句:

• First, high birthrates cannot be altered substantially overnight.
  第一, 高出生率不可能在一夜之内就被改变.
  
• 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.
  
• 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.
  
• The most successful capitalist countries have declining birthrates.
  来自SA
• The Western world is fast committing suicide with extremely low birthrates.
  来自SA
• The ones with the highest birthrates cannot support the people they already have.
  来自SA