Ключевые слова: air, clean, clear, clouds, colorful, conduit, construction, corrosion, country, dam, drain, drainage, drink, environment, environmentalist, flowing, fresh, green, gushing, hole, industrial, industry, jet, landscape, liquid, natural, nature, old, outfall, pipe, pipeline, pump, running, sky, source, stream, transparent, tube, water, waterfall, waterpipe,