Ключевые слова: accessory, background, biology, board, book, chemical, chemisrty, chemistry, class, classroom, concept, copy space, desk, educate, education, elementary, engineering, equipment, experiment, formula, homework, knowledge, learn, learning, liquid, note, notebook, notes, object, office, paper, pen, pencil, physics, professional, research, school, schooling, science, student, study, studying, supplies, table, teacher, technology, theory, university, workplace, write,