Ключевые слова: adult, attractive, audit, blackboard, blond, blouse, board, book, caucasian, chalk, chalkboard, class, classroom, development, education, equation, expertise, female, formulas, indicate, indoors, instructor, lab, lecture, looking, mathematics, mid, numbers, people, person, pointer, portrait, professor, read, room, school, science, scientist, seminar, speaker, standing, student, study, teacher, teaching, univercity, white, woman, women, young,