Ключевые слова: adult, boy, chemistry, child, class, classroom, clever, confident, contemporary, desk, diligent, discussing, education, equipment, explaining, group, human, job, knowledge, lab, learner, lesson, mature, occupation, person, profession, pupil, school, schoolboy, schoolchild, schoolwork, secondary, student, study, subject, teacher, teaching, whitecoat, woman, working,