Health: (bees don't rely on extraordinary memory, but an unexplained instinct. ) Teacher: Did the author give us a definite answer at last? Health: (No, but give us such a vague answer as "unexplained". ) Teacher: Why do you think so? Think about it with the guess of "I" at that time. Health: (Because it says' I' in front, I put the bees in a paper bag and walked more than two miles before I let them out. In other words, the bees didn't see the way I went, but they came back, which means they didn't come back by memory. It's your ability to tell the direction. ) teacher: very well, the author really didn't understand the reason, which reflected the author's scientific research attitude of seeking truth from facts.