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Thank you very much, dear professor; what I am very focused on in my off-line classes is how students should master the topic, not just as a simple matter of remembering a topic but as a lifelong process. I remember learning to draw in school, where teachers taught us for about six years, but I can't even draw a circle right now. It means that the process did not involve lifelong learning. So I wanted to share this video because, even if we are teaching online, we should teach them in such a way that they can go to great depths of knowledge and remember them for a long time.