Ключевые слова: agent, barrier boom, barrier gate, business, care, chemical, concept, danger, dangerous, emergency, engine, environment, fire, flame, flammable, fuel, gas, gasoline, hazard, hazard sign, hazardous, hazardous chemicals, hazardous to the environment, health, heat, industry, label, laboratory, lorry, material, night, object, oil, oxidizing, oxygen, paper, prevent, protect, protection, red, safety, sign, single, stop, symbol, tanker, transport, transportation, warning, yellow,