Ключевые слова: appreciation, audience, audio, auditorium, cheerful, class, communication, conference, consulting, convention, cooperation, corporate, course, discussing, diverse, downloading, earphones, education, entertainment, graduate, hand, happiness, happy, headset, hearing, information, institute, learn, learning, lecture, lesson, listen, listener, listening, meeting, presentation, recognition, school, seminar, sharing, smart, sound, strategy, student, studying, technology, training,