Ключевые слова: background, bunch, bundled, carbon, cast, chrome, circle, close up, construction, cut, cylinder, diminishing, formed, gas, gray, group, heavy, industrial, industry, iron, manufacture, material, metal, metallic, metallurgical, natural, objects, of, oil, parallel, perpendicular, perspective, pipe, pipeline, pipes, round, shiny, silencer, silver, stack, stainless, steel, strength, technology, tube, tubing,