失落的主题在他的许多诗歌中反复出现。

The theme of loss ___recur in many of his poems.

在她的梦里，同一个噩梦会一夜又一夜地重现。

In her dreams, the same nightmare would ___recur night after night.

如果没有适当的维护，这些技术问题肯定会再次发生。

Without proper maintenance, these technical issues are bound to ___recur.