[Retracted] Building English Audio-Visual and Oral Mobile Teaching System Based on Virtual Augmented Reality Technology

Table 2

User registration case description.

Use case name	User registration
Range	User registration module usage
Level	User purpose
Major participants	Students and teachers
Relevant personnel and concerns	Focus
	Teachers want users to enter the registration information correctly
	Students want users to enter their registration information correctly
Preconditions	Log in to the user registration system correctly