classes:  lecturer. activity about the lecture in the classroom, back up a part of theoretical knowledge is very useful for students, the way of teaching is very ok.  curriculum. activity about the lecture in the classroom, back up a part of theoretical knowledge is very useful for students, the way of teaching is very ok.  facility. activity about the lecture in the classroom, back up a part of theoretical knowledge is very useful for students, the way of teaching is very ok.  general. activity about the lecture in the classroom, back up a part of theoretical knowledge is very useful for students, the way of teaching is very ok.