Ключевые слова: activity, architecture, background, blue, building, built, business, city, cloud, clouds, cloudy, colorful, concrete, construction, crane, development, employment, engineering, equipment, estate, frame, heavy, high, house, housing, industrial, industry, job, machine, metal, office, oversize, piston, safety, site, sky, skyscraper, steel, structure, sunset, system, telescopic, tower, urban, wall, white, work, yellow,