Ключевые слова: abstract, background, bilingual, billboard, black, blackboard, board, chalk, chalkboard, characters, chinese, class, concept, dirty, education, english, erased, grunge, handwriting, holiday, idea, journey, knowledge, language, learn, learning, lesson, letters, message, old, school, sign, smudged, symbol, teaching, text, texture, tourism, translation, travel, used, vacation, white, word, write, writing,