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1. Oxford American Dictionary

   birth rate

   • IPA[ˈbərTH ˌrāt]

   美式

   • n.
     the number of live births per thousand of population per year

   • noun: birth rate, plural noun: birth rates

2. • 釋義

   n.

   名詞

   • 1. the number of live births per thousand of population per year a rising birth rate