Ключевые слова: 40s, blank, blue, bright, buzzword, casual, casual clothing, caucasian, chalkboard, colleague, college, complicated, confidence, confident, dialing, difficult, education, equation, eyeglasses, female, function, geometry, head and shoulders, holding, holidays, horizon, huma hand, human body part, human hand, human leg, indoors, knowledge, learning, leisure, math, mathematics, mature adult, occupation, physics, portrait, profession, professional, retired, retirement, sand, school, sea, shape, shorts, single word, sitting, sky, smartphone, smiling, student, studio shot, sunny, teacher, text, text messaging, texting, theory, touching, typing, university, vacation, water, weekend activities, white, white background, woman, wristwatch,