Ключевые слова: angle, arm, background, building, busy, circle, circular, construction, cutter, danger, device, electric, electrical, electricity, equipment, file, grind, grinder, hardware, heavy, housework, industrial, industry, instrument, ironworker, isolated, job, machine, man, manual, metal, object, one, plastic, power, protective, rotation, safety, set, speed, spin, steel, structure, technical, technology, tool, wheel, work,