Ключевые слова: announcement, audience, audio equipment, auditorium, backgrounds, blue, broadcasting, classroom, closeup, communication, convention center, copy space, defocused, discussion, education, equipment, event, focus on foreground, group of people, indoors, learning, lecture hall, macro, message, metal, microphone, microphone stand, musical instrument, musician, performance, performance space, performer, performing arts event, popular music concert, presentation, press conference, public speaker, selective focus, seminar, singer, singing, speaker, speech, stage, stage theater, talking, teaching, technology, theatrical performance,