Ключевые слова: background, barrel, biohazard, biologic, biological, biology, can, cask, caution, chemical, cistern, concept, container, contaminated, contamination, danger, dangerous, drum, ecology, environment, environmental, epidemic, flat, gallon, garbage, hazard, hazardous, icon, illustration, industrial, industry, liquid, metal, object, pollution, power, protection, resource, safety, sign, silhouette, storage, substance, symbol, tank, toxic, virus, waste,