Ключевые слова: academic, background, black, blackboard, board, book, business, chalk, chalkboard, class, classroom, cognition, college, communication, concept, course, culture, dialect, educate, elementary, grammar, homework, information, knowledge, language, learn, lesson, library, literature, office, old, page, phrase, read, school, science, stack, student, study, symbol, talk, teacher, text, textbook, university, white, wisdom, wood, word, write,