Ключевые слова: background, blue, carcass, coating, construction, cover, coverage, engineering, equipment, factory, flyover, frame, gas pipeline, industrial, industry, loaded, long, longed, longspan, main, metal, outdoors, outside, overpass, piles, pipelines, pipes, plates, sky, stack, stacked, steel, structure, tiered, trestle, trestlework, viaduct,