Ключевые слова: adult, background, banner, blackboard, career, caucasian, chalkboard, classroom, college, computer, courses, day, design, desk, education, exam, female, indoors, instructor, intelligent, job, knowledge, laptop, learn, lecturer, lesson, mathematics, mentor, occupation, person, portrait, professional, professor, pupil, room, school, science, student, study, table, teacher, technology, test, trainer, tutor, university, woman, working, writing, young,