Ключевые слова: academic, academy, adult, background, board, business, caucasian, class, classroom, clipboard, college, communication, course, department, education, educational, equation, explain, explaining, female, giving, happy, intelligence, knowledge, learn, learning, lecture, lesson, math, mathematics, mature, occupation, person, portrait, profession, professional, professor, school, senior, smart, smiling, study, teach, teacher, tutor, university, whiteboard, woman, work,