classes:  lecturer. Enthusiastic teachers, thoroughly answer the questions of students, always stick close and actively support students when they encounter difficulties in the process of completing the subject.  curriculum. Enthusiastic teachers, thoroughly answer the questions of students, always stick close and actively support students when they encounter difficulties in the process of completing the subject.  facility. Enthusiastic teachers, thoroughly answer the questions of students, always stick close and actively support students when they encounter difficulties in the process of completing the subject.  general. Enthusiastic teachers, thoroughly answer the questions of students, always stick close and actively support students when they encounter difficulties in the process of completing the subject.