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Students, this kind of question can also be used as the last question to pull points. It is simply a question to give points. The teacher uses three methods to explain it to you. This fan, there are some problems with your doctoral thesis. From the application of particle science, it does not conform to particle field theory. What? Don't know particle field theory? Particle field theory explains atomic structure, atomic spectrum... Enter the National Academy of Sciences? Sorry, my interest is to take classes and become an honorary academician? Let me think about this. This is the story of a super genius from the earth who, in order to obtain more advanced scientific knowledge and products in the system, teaches and educates people in another world, preaching and gaining karma.