Ключевые слова: abstract, background, beautiful, black, business, circle, closeup, cog, cogs, cogwheel, concept, connect, construction, cooperation, design, engine, engineering, gear, gearbox, gears, grunge, industrial, industry, iron, isolated, machine, macro, mechanical, mechanics, mechanism, metal, metallic, motor, movement, parts, power, precision, retro, rotate, science, steel, synergy, teamwork, technical, technology, vintage, wheel, wheels, white, work,