Ключевые слова: clean, construction, control, counter, drink, drinkable, engineering, equipment, faucet, filter, filtration, fuel, gas, gold, golden, healthy, icon, illustration, indicator, industrial, industry, instrument, isolated, liquid, long, measurement, metal, meter, natural, object, oil, pipe, pipeline, plumbing, pressure, purification, purity, set, sewer, shadow, steel, symbol, system, technology, tube, valve, water,