Ключевые слова: adult, applause, audience, brown hair, casual clothing, caucasian, clapping, curly hair, education, ethnic, event, facial expression, glasses, group of people, hands, happiness, hoodie, indoor, jacket, joy, knowledge, learning, lecture, male, man, one person, people, person, professor, public speaking, seminar, smile, student, success, support, teacher, training, university, workshop,