Ключевые слова: adult, announcement, attendant, audience, audio, auditorium, blurred, center, closeup, communication, concert, conference, congress, convention, corporate, course, day, education, equipment, focus, freedom, graduates, guest, handsome, hearing, host, indoor, international, knowledge, leading, lecture, lecturer, light, loudspeakers, man, microphone, modern, music, national, people, person, presentation, professional, public, seminar, singer, speaker, training, wedding,