Ключевые слова: architecture, brown, burner, burning, casting, closeup, control, crucible, dust, energy, environment, equipment, factory, field, flame, forging, framework, furnace, gray, heat, industry, landscape, light, machinery, manufacturing, melting, metal, pollution, process, processing, production, red, risk, security, smelting, solid, steel, steel plate, still life, structure, technology, workshops,