Ключевые слова: academic, adult, background, basic knowledge, bearded man, big, caucasian, chalk, chalkboard, class, college, concept, copy space, different, disciplines, draw, explore, formal, higher education, hold, homework, how, indoors, investigation, jacket, knowledge, learn, lecturer, lesson, line, man, math, mature, plastic, research, ruler, school, senior, share, standing, stem, straight, study, subjects, succeed, teaching, tutor, university, university lecturer, useful knowledge,