half-life of recurrent selection process

例句：

1. 1. The patient's symptoms have been recurrent in the past few weeks.
   病人过去几周的症状一直反复出现。
2. 2.The research has shown that climate change is a recurrent problem.
   研究表明气候变化是一个反复出现的问题。
3. 3. The team had to deal with recurrent technical issues throughout the project.
   团队在整个项目过程中不得不应对反复出现的技术问题。