Ключевые слова: brown, cement, clean, close, concrete, conduit, construction, corrosion, danger, dark, decay, development, dirty, drainage, ecology, elements, flow, flowing, gas, grass, green, ground, heavy, hole, industrial, industry, large, long, natural, nature, old, parallel, pipe, pipeline, piping, plumbing, polluter, public, round, sewage, sewer, straight, technology, texture, tube, underground, up, water, waterway, winter,