Ключевые слова: abstract, adult, audience, background, blur, blurred, boardroom, business, businessman, center, coaching, communication, conference, congress, convention, cooperation, corporate, design, education, event, explaining, forum, gesturing, group, hall, indoors, international, learn, lecture, light, meeting, microphone, modern, participants, people, person, podium, presentation, public, room, seminar, speaker, speaking, speech, study, studying, teacher, teaching, training, university,