Ключевые слова: aid, audience, audiovisual, auditorium, business, classroom, closeup, communication, concepts, conference, contemporary, data, display, education, equipment, film, hall, horizontal, ideas, image, information, lecture, lens, light, lighting, liquidcrystal, marketing, meeting, meetings, movie, multimedia, no, office, people, presentation, professional, project, projection, projector, room, screen, seminar, showing, slide, teaching, technology, video, visual,