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

Lectures were sometimes repetitive or obvious, but occasionally, they provided new insights."

讲座内容有时重复或明显，但是偶尔会提出新的观点“

耶鲁公开课 - 死亡课程节选

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

Well a calorie technically--and this is again, not something that we would ever quiz you on but I just thought you might be interested to know-- that it's the energy required to raise one gram of water one degree centigrade, and we'll talk in a minute about you might go about measuring that.

理论上一卡路里,我重复下,这不是考试内容,但我想你们会感兴趣,一卡路里,是将一克水提升1℃所需要的热量,过会儿我们会讲如何测量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选