Ключевые слова: academic, aged, algebra, analyzing, ask, attention, board, business, businessman, caucasian, clever, college, concentration, desk, discovery, education, elderly, elegant, equation, exercise, expertise, eyeglasses, focus, formulas, graphic, gray hair, ideas, indoors, innovation, knowledge, lecture, lesson, male, man, mathematics, maths, mature, physics, profession, school, schoolwork, screen, senior, smart, suit, teacher, university, white, write, written,