Excuse me, do you want to ask the question "What does Chang 'an Deep Blue Belt mean?"? The meaning of this sentence is as follows:

Changan Deep Blue refers to the marketing strategy of Changan Deep Blue brand cars, and encourages existing car owners to introduce new customers to buy Changan Deep Blue brand cars. After the old owner introduces the new owner to buy a car, the new owner can get certain discounts or gifts, and the old owner can also get corresponding rewards or points. This marketing strategy is called "bringing the old with the new" and is a common automobile sales model.