Ключевые слова: announcement, audience, audio, background, blue, blur, bokeh, business, chair, cinema, classroom, close, communication, concept, concert, conference, convention, corporate, education, equipment, event, green, group, hall, hotel, lecture, meeting, mic, participant, party, people, podium, presentation, professional, room, row, screen, seminar, show, sound, speak, speech, stage, stand, talk, technology, up, video, vip, voice,