Ключевые слова: addiction, art, barrel, cloud, color, colorful, container, contour, drop, dustbin, electric, energy, environment, exhaust, factory, fuel, garbage, generator, health, icon, illustration, industrial, industry, isolated, line, linear, mask, measurement, nicotine, oil, outline, panel, petrol, pollution, pop, popart, power, protection, pump, set, station, tobacco, transport, turbine, vehicle, wastewater, water, weather,