classes:  lecturer. I think the lecturer in the theoretical class must have certain pedagogical skills, the ability to communicate, how to guide students, but in this class, the lecturer can not do that.  curriculum. I think the lecturer in the theoretical class must have certain pedagogical skills, the ability to communicate, how to guide students, but in this class, the lecturer can not do that.  facility. I think the lecturer in the theoretical class must have certain pedagogical skills, the ability to communicate, how to guide students, but in this class, the lecturer can not do that.  general. I think the lecturer in the theoretical class must have certain pedagogical skills, the ability to communicate, how to guide students, but in this class, the lecturer can not do that.