When you listen to a lecture, you can note down your questions while listening, and ask the lecturer in the Q&A session.

听讲座时，你可以边听边记下你的问题，并在问答环节询问演讲者。

Note down these questions.

将问题记录下来。

Note down the activation code.

记下激活代码。

Note down the words in the notebook.

把单词记在笔记本中。

You don't have to note down all the details.

你不用记下每一个细节。