recurrent appropriation

例句：

1. 1. The patient's symptoms are recurrent, with each episode lasting several weeks.
   患者的病症是复发的，每次发作持续几周。
2. 2.The recurrent attacks of the disease were causing significant discomfort for the patient.
   疾病的复发发作给病人带来了极大的不适。
3. 3. The recurrent problem has been a persistent challenge in the project.
   反复出现的问题一直是项目中的一个持续挑战。