Ключевые слова: adult, arm, background, black, blackboard, board, bulb, business, chalk, chalkboard, clear, communicate, communication, concept, conceptual, dark, drawing, education, female, hand, holding, idea, indoors, learn, lesson, light, lightbulb, manual, message, outdated, plan, point, pointing, present, round, scribble, show, sketch, space, strategy, teach, texture, touch, way, white, woman, write, writing, written, young,