1. "Five tones": when guests come, they greet them, when they leave, they send them off, when they get help, they thank them, when they are inadequate, they apologize, and when they do things for them, they echo;

2. "Four languages": contempt language, irritability language, negation language and quarrelsome language.

The catering industry, the main content of which is that organizations or individuals engaged in this industry can meet the dietary needs of diners by processing food, so as to obtain corresponding service income. Due to the different eating habits and tastes of different people in different regions and cultures, the catering around the world shows diversified characteristics.