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"What you are saying is quite interesting. Could you explain it a little (more) ?'

Meaning of these two sentences:

One person is listening to another person talking on a subject. The listener finds that the talk is relevant to him (or her). He (She) has found one particular point that the talker has said, to be very interesting (and useful) to him (her). But the talker has not mentioned much about that point. So he (she) asks the talker to explain or describe that in more detail.

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