Ключевые слова: background, big, bunch, circle, cog, cogwheel, collection, concept, conceptual, connected, cutout, detail, dirty, element, engine, engineer, equipment, few, gear, greasy, group, heavy, industrial, industry, interesting, interlocking, isolated, large, machine, mechanical, mechanics, mechanism, metal, metallic, object, part, ratchet, science, set, sprocket, technology, teeth, time, tool, wheels, zzzaabaaaieefdedfpdgdbdddj,