Ключевые слова: animal, background, bad, black, canal, chemical, contaminate, contaminated, contamination, danger, dangerous, dark, dead, death, decay, dirty, disease, ecological, ecology, ecosystem, environment, environmental, fish, float, food, garbage, harmful, industry, lake, life, marine, nature, plants, poison, pollute, polluted, pollution, pond, problem, river, rotten, sea, sewage, smell, stink, therapy, toxic, waste, wastewater, water,