There is a difference between science and art: science emphasizes the latest discoveries, the latest laws, and equations, and the pattern is always refurbished and always runs straight forward. Art is not so convenient, no matter there are existing laws, The equation can be used for plagiarism and application, so that the art can form a relay race-like progress like scientific research. In this subtle and subtle meaning, the father cannot teach the son, the mother cannot instruct the daughter, and everything has to be done by itself. What does "this" mean? ['Activities such as artistic creation or appreciation.', 'The difference between science and art.', 'All artistic achievements in China.', 'Stunts passed down from generation to generation in the family.']