尽管老师已经解释了三次，他仍然固执地重复着同一个问题。

Even after the teacher explained three times, he kept ___perseverating on the same question.

自闭症儿童有时会持续重复同一个单词，这是一种典型的刻板行为。

The autistic child kept ___perseverating on the same word, which is a typical repetitive behavior.