Ключевые слова: adult, black, board, calculation, child, class, classroom, count, course, education, elementary, explain, females, friendship, hands up, happy, indoors, instructor, intelligence, joy, knowledge, learn, learning, lesson, lifestyles, listening, looking, marker, math, mathematics, people, person, profession, professional, professor, question, school, showing, sitting, standing, students, study, studying, teach, teacher, teaching, together, whiteboard, woman, young,