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When a doctor explains a problem to a patient, who’s at fault if the patient doesn’t understand? We don’t expect the two to have the same depth of knowledge afterwards but if the patient walks away totally baffled, the doctor failed to explain the problem in a relatable way.
As someone else said in this thread, communication is a two-way street. The "recipient" in this situation should also put effort in both trying to understand and actively communicating whether he understood the topic or not, showing if he needs more explanation, etc.
