Ключевые слова: abstract, audience, auditorium, background, blur, blurred, boardroom, business, classroom, communication, computer, concept, conference, congress, convention, corporate, education, group, hall, knowledge, learn, lecture, light, media, meeting, microphone, modern, note, people, person, presentation, projector, public, room, school, screen, seminar, sit, speaker, speaking, speech, student, study, studying, teacher, teaching, technology, training, university, women,