Ключевые слова: background, canal, chemical, contamination, damage, danger, destruction, dirt, dirty, disaster, drain, drainage, dump, ecology, environment, environmental, factory, flowing, garbage, horizontal, industrial, industry, lake, liquid, natural, no people, outdoor, pipe, pipeline, plant, pollute, pollution, pond, pouring, problem, recycling, river, rust, sea, sewage, sewer, stream, substance, toxic, tube, unhygienic, waste, water, water pollution,