Ключевые слова: battery, benzene, black, bulb, business, button, charge, cloud, commercial, conservation, contemporary, drop, ecological, ecology, efficiency, electricity, energy, environment, factory, fan, filling, fire, frame, fuel, globe, icon, industrial, isolated, light, line, motor, nuclear, nucleus, oil, petroleum, power, propeller, realty, recycle, recycling, simple, smoke, solar, stack, station, sun, symbol, ventilator, wind,