Natural class. Among them, Neo-Confucianism is the natural science in the most traditional sense, with seven categories and sixteen subcategories. I make a list of 16 categories: mathematics, physics, chemistry, biological science, astronomy, geology (which can also be included in geographical science), geographical science, marine science, atmospheric science (which has a great intersection with marine science), mechanics (which can also be included in physics), electronic information science (which can also be included in physics) and materials science. Mathematical culture also belongs to mathematics, which is nature.