Ключевые слова: abstract, architecture, background, bar, black, brown, building, cement, closeup, concrete, construction, danger, design, engineering, equipment, footing, frame, industrial, industry, iron, job, material, metal, mountain, old, outdoor, oxidation, pattern, rebar, red, reinforcement, rod, rust, rusty, safety, scaffolding, site, sky, steel, stone, structure, support, texture, tool, tractor, wire, work, worker, workers, workplace,