The public **** area, the guest room area, and the backyard area are the three core areas of a hotel. The public **** area is the area of guest activities, such as the lobby, dining area. The guest room area refers to the elevator hall, corridor and guest room rooms on the guest room level, and the executive lounge. The backyard area refers to the area where the administrative and logistical staff work, such as staff offices, kitchens, service aisles, fabric rooms, laundry rooms, staff dormitories, storage rooms and so on.