contraception rate

例句：

1. 1.The contraception rate in this region is significantly lower than the national average.
   该地区的避孕率远低于全国平均水平。
2. 2.The government has been working hard to improve the contraception rate among teenagers.
   政府一直在努力提高青少年的避孕率。
3. 3. The study found that the contraception rate had increased significantly since the introduction of new methods.
   研究发现，自从采用新方法以来，避孕率显著提高。