Ключевые слова: adult, attentive, audience, auditorium, background, black, blur, business, coaching, concept, conference, congress, crowd, education, event, female, foreground, forum, girl, group, hall, human, information, judicial, knowledge, learn, lecture, lecturer, listeners, male, many, meeting, men, occupation, one, participants, people, person, presentation, public, room, seated, seminar, sit, speaker, technology, training, view, watching, woman,