Ключевые слова: activity, apartment, architecture, blue, buildings, built, business, city, civil, colored, concrete, construction, crane, development, engineering, equipment, factory, frame, gray, heavy, high, house, housing, industry, iron, job, machinery, mixer, occupation, outdoors, overhead, picking, plan, reinforcement, residential, roof, scaffolding, site, sky, steel, structure, tall, tower, up, urban,