First, the teacher is the subject and the student is the object. This view is that teachers are in absolute dominance in educational activities, and students are in absolute dominance. This view is "teacher-centered theory." Second, students are the main body, and teachers are completely controlled by the requirements of students. This view is that teachers are absolutely dominated in educational activities. This view is "student-centered theory." Third, teachers and students are mutually subjective objects. In educational activities, teachers, as a certain social educational purpose, undertake certain educational tasks, and use certain educational resources on the basis of their own knowledge and skills to carry out educational practice activities for students. There is no doubt that teachers are the main body of educational practice activities. In educational activities, even though students are the objects—objects of educational activities, students, as people with certain cognitive and practical capabilities, are also active as subjects. With regard to the educational activities carried out by teachers as the main body, students also actively know and practice in such activities. Students also take teachers and all the educational resources used by teachers in educational activities as objects of knowledge and practice. In view of the relationship between teachers and students as subjects and objects, in modern education thought, people generally think that teachers play a leading role in educational activities, while students play a subject role in learning activities.