Ключевые слова: academic, audience, auditorium, background, blur, blurred, business, businessman, center, coaching, communication, concept, conference, congress, convention, corporate, education, educator, event, explaining, forum, group, hall, indoor, indoors, information, institute, knowledge, learn, lecture, lecturer, light, listeners, male, man, meeting, participants, people, presentation, professional, public, room, seminar, sitting, speaker, speech, study, teaching, training, university,