Rarely does the narrator comment on or explain a character's actions or thoughts or motives. There's only the barest minimum of dialogue.

作者极少评价或解释一个人物的行为,或思想或动机，文章中只有不能再直白的对话。

耶鲁公开课 - 旧约导论课程节选

And it is not about giving either time out or motivation to keep people engaged.

也不是通过腾出时间或,加强动机以使人们参与。

麻省理工公开课 - 媒体、教育、市场课程节选

Motive would only go about four, five, six notes.

动机只会有四,五,或六个音符

耶鲁公开课 - 聆听音乐课程节选