Ключевые слова: 2021, 3d, 3d rendering, annual, business, calendar, card, celebration, chemical, construction, date, december, ecology, economic, energy, engineering, equipment, event, exploration, fuel, gas, heavy, icon, industry, innovation, liquefied, liquid, lng, manometer, manufacturing, mechanism, mine, mineral, natural, new, number, oil, petroleum, power, production, resource, rig, season, sign, silhouette, symbol, technology, text, time, year,