Answer: It is a principle of etiquette that is widely emphasized in countries around the world. "The six M's are cost, meeting, menu, behavior, music and environment. It means that when arranging or participating in a catering event, you must give priority to the six aspects of cost, meeting, menu, behavior, music and environment, and you should strive to make what you do in these areas in line with the norms of self-regulation and respect for others.