Ключевые слова: academic, adult, audience, background, blur, blurred, business, casual, coaching, conference, congress, convention, corporate, crowd, education, event, forum, group, hall, learn, lecture, listening, meeting, men, occupation, participants, people, person, present, presentation, presenter, professional, public, room, seminar, sitting, speaker, speech, strategy, student, study, teacher, teaching, team, teamwork, training, young,