crude birth rate

例句：

1. 1. The crude birthrate in the country is declining.
   该国的粗出生率正在下降。
2. 2. Thecrude birth rate is a key indicator ofpopulation growth.
   粗出生率是衡量人口增长的关键指标。
3. 3. The crude birth rate hasbeen steadily increasing over the past decade.
   过去十年里，粗出生率一直在稳步上升。