Ключевые слова: advance, applause, boss, business, clapping hands, conference, daylight, education, elderly, employee, female, folder, glasses, gray, group, hair, holding, improvement, improving, indoor, knowledge, learning, lecturing, men, people, presentation, professor, progress, projector, prosper, room, satisfied, selective focus, seminar, sharing, short, showing, sitting, specialization, standing, students, successful, teaching, window, woman, women,