Cross-domain cannot be just for the sake of cross-domain. It is originally a kind of daily thinking. Pay attention to the daily routine of the way things are. A logical routine. The phenomena in culture should be the sum of all aspects. This is the essence of culture. It is only natural to cross-domain when preparing for a course before completing it. For example, when talking about peach orchard grass, it is natural to go to the place of discovery and let the situation repeat itself. When it comes to thermodynamics, we use resistance to generate heat. Implementation and practice have always been the original intention and belief of course design.