Ключевые слова: 30s, adult, answering, attention, boys, childhood, children, classmates, classroom, close up, communication, copy space, day, education, elementary school, elevated view, girls, horizontal, indoors, interested, kids, knowledge, learning, lesson, listening, medium group of people, millennial, multiethnic group, preteens, primary school, pupils, raising hands, school, school kids, schoolboys, schoolchildren, schoolgirls, selective focus, sitting at table, smiling, teacher, teaching, volunteering, waist up, woman, working, writing, young adult, youth,