Ключевые слова: black, chemical, clean, concrete, dirty, ecology, environment, environmental, flow, flowing, fluid, garbage, generation, industrial, industry, liquid, mud, old, pattern, pipe, plant, pollution, pool, pouring, pressure, production, pump, reflection, residential, ripple, river, round, rust, rusty, sea, sewage, smell, station, storage, store, stream, system, tank, treatment, tube, view, waste, wastewater, water, wave,