Ключевые слова: advertising, arm, background, blackboard, blank, board, breaking, business, caucasian, chalk, chalkboard, closeup, detail, draw, drawing, education, element, female, fingers, girl, graphic, hand, hand holding, holding, horizontal, lady, learn, lesson, line, macro, palm, people, person, piece, pieces, school, sign, slow motion, student, study, symbol, teacher, training, university, unrecognizable, woman, woman hand, write, writing,