agespecific natality rate

例句：

1. 1.The age-specific natality rate is an important indicator of fertility rates.
   年龄特定的生育率是衡量生育率的一个重要指标。
2. 2. The study found that the age-specific natality rate was significantly higher in urban areas.
   研究发现，城市地区的年龄特定生育率显著高于农村地区。
3. 3.The policy aims to reduce the age-specific natality rate and improve population health.
   该政策旨在降低年龄特定的生育率并改善人口健康。