classes:  lecturer. lecturers need to teach and guide the practice of each lesson of each session so that students understand and practice.  curriculum. lecturers need to teach and guide the practice of each lesson of each session so that students understand and practice.  facility. lecturers need to teach and guide the practice of each lesson of each session so that students understand and practice.  general. lecturers need to teach and guide the practice of each lesson of each session so that students understand and practice.