如果你不明白一个问题的答案，就请医生再解释一遍，直到你明白为止。

If you don't understand the answer to a question, ask the doctor to explain it again until you do understand.

youdao

如果你不明白为什么一直和朋友争吵，问问自己在什么地方与朋友有分歧，而不是为什么争吵。

If you don't understand why you keep arguing with a friend, ask yourself what you disagree on instead of why you're arguing.

youdao

如果你不明白的话，一定要毫不迟疑地发问。

If you don't understand, don't hesitate to ask.

youdao

If you have any questions, anything that's not clear, if you agree or disagree with something, email me or email your TF and we'll always respond.

如果你有任何问题或不明白的地方，如果你同意或反对什么观点，请给我或助教写邮件,我们一定会回复的。

哈佛公开课 - 幸福课课程节选