Ключевые слова: 1, adult, beard, bearded, blackboard, book, casual, caucasian, chalkboard, cheerful, class, classroom, education, educator, expression, foreign, glasses, guy, hello, holding, human, job, knowledge, language, learning, lecturer, library, literature, male, man, occupation, one, online, people, profession, professor, school, shot, smart, studio, teacher, text,