Ключевые слова: academy, adult, asian, attention, background, calculate, ceducation, cheerful, class, classroom, coaching, college, course, education, explain, faculty, female, formula, happy, high, instructor, knowledge, learn, learning, lecture, lesson, listen, looking, math, mathematics, paper, pen, people, profession, professor, school, semester, sitting, smiling, standing, student, study, studying, table, teacher, teaching, uniform, university, whiteboard, work,