recurrent

a. 再发生的,定期重覆的,循环的

I have a recurrent dream that I've turned into an elephant.

我屡次梦见自己变成了大象.

A narrative poem, often of folk origin and intended to be sung, consisting of simple stanzas and usually having a recurrent refrain.

民谣常是源于民歌并适于演唱的叙事诗歌，由简单诗节组成，通常有循环迭句