Ключевые слова: abstract, achievement, background, bilingual, billboard, black, blackboard, board, business, chalk, chalkboard, characters, chinese, class, concept, dirty, education, english, erased, goal, grundge, grunge, hand, handwriting, inspiration, knowledge, language, learn, learning, lesson, letter, letters, old, progress, school, sign, smudged, solution, success, teaching, text, texture, thumb up, translation, used, white, win, word, write,