Get into the habit of mentally trying to reteach yourself what the teacher is saying.

养成一种习惯，大脑去努力重新教自己老师在说什么。

At the end of each lecture, I would take ten minutes to summarize and reteach the main points of what I just learned using simple language.

在每堂课结束后，我会用十分钟的时间，用简单的语言把刚才所学的知识要点进行总结和再讲解。