Ключевые слова: adult, asking, attention, audience, auditorium, business, businessman, businesswoman, chair, colleague, conference, conference room, crowd, crowded, discussion, education, engagement, entrepreneur, event, expertise, females, focus, gathering, group, hall, horizontal, indoor, indoors, interaction, learning, lecture, listening, males, man, many, meeting, occupation, people, person, presentation, professional, public, seat, seminar, speaker, stadium, stage, walking, women,