Ключевые слова: adult, african, africanamerican, american, attractive, black, blackboard, board, chalkboard, class, classroom, college, educate, education, equation, ethnic, global, group, hand, handsome, happy, learn, learning, life, lifestyle, male, man, math, men, minority, native, people, person, pointing, professor, raised, school, smile, student, study, studying, teacher, teachers, teaching, technical, trigonometry, university, white, work, young,