Ключевые слова: assembly, attendee, audience, back, background, briefing of students, business background, business conference, business conferences, class, classroom, concept, conference audience, counsel, desk, education, education background, educator, faculty, institute, instructor, learning, lecture, lecture hall, lecturer, lesson, lightman, people, person, room, school, seminar, seminar audience, silhouette, student, students, study, table, teach, teacher, teacher participants, teaching, the lecturer, university, young,