Ключевые слова: background, business, childhood, circle, clockwork, cogwheel, color, colorful, concept, conceptual, energy, engine, engineering, equipment, fun, gear, green, industrial, industry, isolated, kid, machine, machinery, mechanics, mechanism, metal, metallic, motion, object, power, precision, red, rotate, rotation, spin, steel, team, teamwork, technical, technology, teeth, toy, transmission, turn, wheel, whirligig, white, wood, work, young,