Ключевые слова: background, banner, books, cartoon, chemical, chemistry, class, computer, concept, course, design, education, equipment, flat, graphic, homepage, illustration, internet, knowledge, lab, laboratory, landing, laptop, learn, microscope, molecule, online, page, people, person, school, science, scientific, scientist, set, student, study, symbol, teacher, template, test, tube, vector, web, website,