建议你用的句子：
Could you please rephrase that question/topic?
I\'m not exactly sure what you mean...
I\'m not exactly sure how to answer that question, but (perhaps)...
That\'s a rather difficult question, but (maybe)...
I\'m sorry, but I don\'t know much about...
However, it might be possible that－

　　Maybe I can answer your question by telling you about a personal experience I had.
That\'s an interesting question...
Let me see. Well, I suppose that...
Well, I think there are 2 (or 3 or more) reasons:
First, ... Second, ... Finally,...
In my opinion there are three ways of looking at it:
First of all, ... Next, ... Then, ...
Have I given you enough information?
Would you like me to tell you more about...?
Is that all you\'d like to know?
I\'m afraid that\'s about as much as I know.
I think that\'s about it.
I can\'t think of anything else right now...

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