Ключевые слова: 30s, activity, adult, african, afro, american, audience, auditorium, briefing, business, coaching, communication, conference, confident, cooperation, corporate, educating, education, emotions, ethnicity, explaining, group, indoors, interaction, interior, leadership, lecture, lecturer, male, man, meeting, microphone, motivation, participants, people, portrait, positive, presenting, professional, public, scene, speaker, stage, studying, success, teaching, training, whiteboard,