Ключевые слова: accessory, back, black, blackboard, board, book, caffeine, chalk, chalkboard, chemisrty, class, classroom, concept, copy space, desk, educate, education, elementary, equipment, experiment, homework, horizontal, knowledge, learn, library, liquid, literary, literature, microscope, molecular, nobody, note, notebook, object, office, pen, research, school, schooling, structure, student, studying, supplies, table, university, wisdom, write,