Ключевые слова: adult, blackboard, board, book, calculus, casual, caucasian, circuit, class, classroom, college, denim, desk, diagram, diversity, education, educational, electrical, electrician, handsome, man, marker, math, mathematics, measurement, men, nametag, people, person, room, ruler, screen, student, teacher, teaching, technical, trigonometry, vocational, watch, white, write,