Ключевые слова: barrel, battery, bulb, button, chemical, clip, collection, computer, conservation, diesel, digitally, drop, electricity, energy, environmental, ethanol, fire, flame, flat, fuel, gas, gasoline, generated, group, icon, industry, interface, leaf, light, lightbulb, lightning, line, natural, nuclear, oil, outlet, pipe, plug, power, pump, rig, set, sign, simple, station, supply, symbol, tanker, water,