Ключевые слова: academic, atom, blackboard, book, chalkboard, chemical, chemist, chemistry, class, classroom, college, course, discussing, education, exam, explaining, homework, learning, lecture, lecturer, lesson, looking, man, mentor, model, molecular, molecule, physicist, physics, preparation, preparing, reading, research, revising, revision, school, science, scientific, scientist, student, study, studying, teacher, teaching, textbook, trainee, training, tutor, university, young,