Ключевые слова: 20s, academic, adult, american, answering, asian, campus, casual clothes, class, classroom, college, confidence, course, diligence, economics, education, explaining, female, focus, group, high school, indoors, intellect, knowledge, law, lecture, lecture hall, lesson, lifestyle, listening, literature, mathematics, method, modern, people, person, physics, positive, professor, seminar, skill, smart, studying, talking, teacher, teaching, woman, young,