A mantra is something that you would just repeat over and over, for example, the syllable that everyone seems to be familiar with and popular one like Om, you can say Om over and over.

曼怛罗就是咒语,你一遍遍重复的内容，比如，大家都熟悉的音节,或唵这种众所周知的，你可以重复念唵音。

普林斯顿公开课 - 人性课程节选

At times we have whole books that repeat or go over the same material.

有时候，有一整本书都在重复同样的内容。

耶鲁公开课 - 旧约导论课程节选

Not a repeat of what's happening in the class; I don't want to hear what was in the readings, I don't want to hear what was in the lecture undigested.

而不是对课堂内容的重复,我不想看到阅读资料里的内容,我不想看到未经消化理解过的内容

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

He does go around and around the same idea a number of times, which does cut down on the notes for the class, " but it can get a little boring."

他的确一遍遍重复同样的观点很多次，从而减少了课程的笔记内容，但是会让人感到有点无聊“

耶鲁公开课 - 死亡课程节选