Let me give you an example. It probably happened to you multiple times in high school.
You were listening to the teacher. Suppose you felt that you understood her explanation on a subject very well, whatever that was. Then, when finished, the teacher turns around and asks ¨who can summarize what I just explained?¨
Suddenly you hope you will not have to answer it ... And if you had to answer, you stumbled, trying to explain what you just heard that you understood very well a few minutes earlier.
Do you remember those moments?