Ключевые слова: abstract, arc, background, big, bridge, brown, chaos, clamp, clip, concept, confused, connect, connection, construction, design, detail, different, dirt, dust, dyed, engineering, equipment, few, flange, form, hard, hold, hole, industrial, industry, iron, knot, loop, lot, material, metal, metallic, mount, old, red, round, rusty, safety, security, semicircle, small, steel, strength, strong, used,