Ключевые слова: blue, bright, canal, concrete, conduit, construction, damage, danger, dirty, drain, drainage, dump, ecology, environment, environmental, flow, flowing, fluid, garbage, gray, green, group, industrial, industry, joint, liquid, nature, ocean, old, pier, pipe, pipeline, platform, pollution, pouring, recycling, river, sea, sewage, sewer, shore, sky, steel, stream, system, toxic, treatment, tube, waste, water,