1. sales consultant/sales manager: the sales consultant is a salesperson in a 4S store, who is responsible for introducing models to customers, answering questions and promoting sales. Sales consultants usually need to go to customers to promote sales or negotiate with customers in 4S stores, while sales managers are responsible for managing sales teams and communicating and negotiating with customers.

2. After-sales service personnel/service consultants: After-sales service personnel are maintenance engineers in 4S stores, responsible for car repair and maintenance, and often need to go to customers' enterprises or families for on-site service, while service consultants are responsible for communicating with customers in order to provide customers with a better after-sales service experience.