recur
/rɪˈkɜː(r)/verb
(recurred, recurring)no obj.
1- occur again, periodically, or repeatedly再发生, 周期性发生, 反复出现：
when the symptoms recurred, the doctor diagnosed something different
症状复发时, 医生作出不同的诊断
as adj. recurring a recurring theme.反复出现的主旋律。
1.1
- (of a thought, image or memory) come back to one's mind（思想、形象或记忆）重现, 再现：
Oglethorpe's words kept recurring to him.
奥格尔索普的话不停地在他的耳边回响。
1.2
recur to
go back to (something) in thought or speech（思考或讲话时）重新回到, 反复提及：the book remained a favourite and she constantly recurred to it.
她一直喜爱这本书, 经常提起它。
派生词
recurrence
noun词源
Middle English （in the sense 'return to'）： from Latin recurrere, from re- 'again, back' + currere 'run'.