Ключевые слова: academic, atom, back, board, book, chemical, chemist, chemistry, class, classroom, college, concerned, course, desk, diligent, education, educational, exam, exams, high, learn, learning, lesson, man, model, molecular, molecule, physicist, physics, preparation, preparing, research, revising, revision, school, science, scientific, scientist, smart, student, study, studying, textbook, thinking, to, trainee, training, university, whiteboard, young,