Ключевые слова: auditorium, background, black, blackboard, board, book, books, botany, chalk, chalkboard, chemistry, class, classroom, college, concept, desk, educate, education, educators, elementary, equipment, formulas, hand drawn, homework, inscription, knowledge, laboratory, learn, learning, library, liquid, literature, mathematics, micro, microscope, pencil, school, science, sketch, stack, student, students, study, studying, supplies, table, top view, university, wisdom, write,