Does the question depend on this situation also. I didn't think of it.Why haven't you understood what the other person is saying?
Is it because you don't understand the meaning of his words, or because he is being vague, or because you can't hear him properly?
I'm in your position now.What should I say, when a person is saying about something which I heard clearly but couldn't understand. Is there other better choices than clear?
How can I explain now, suppose he is talking about a thing about which I have less knowledge or not well informed.I'm in your position now.
Do you mean his words were so vague that most people wouldn't understand them? Or do you mean he used words/expressions that you hadn't heard before? Or was he referring to some idea or concept that you don't know anything about?
Could you please explain that?
Could you please clarify what you mean by ...?
Could you say that more simply please?