(In Xu Cen and Qin Yanqing's cooking tutorial, Qin Yanqing introduced 20 dishes. The specific dishes are shown in the course outline, and Xu Cen introduced four "Xu's family dishes". The course aims to provide more feasible suggestions for those who want to cook at home, and how to master more than 20 dishes in a short period of time, and encourage inferences from one instance to other cases.)