Ключевые слова: background, beach, brown, canal, chemical, clean, construction, corrosion, day, dirty, disaster, drain, drainage, ecology, energy, environment, equipment, flood, flow, flowing, fluid, garbage, green, industrial, industry, influence, liquid, natural, nature, old, outdoor, pipe, piped, pipeline, pollution, pump, refinery, river, rusty, sewage, sewer, station, stream, toxic, treatment, tube, unhygienic, waste, water, waterfall,