classes:  lecturer. always point out good and fast tips, help students achieve high achievements, and especially understand the problem in depth!  curriculum. always point out good and fast tips, help students achieve high achievements, and especially understand the problem in depth!  facility. always point out good and fast tips, help students achieve high achievements, and especially understand the problem in depth!  general. always point out good and fast tips, help students achieve high achievements, and especially understand the problem in depth!