Ключевые слова: african, american, builder, command, concept, construction, contractor, engineer, engineering, equipment, grove, hand, hardhat, helmet, industrial, industry, innovative, inspect, inspector, machine, maintenance, male, man, manual, manufacturing, mechanic, mechanical, metal, operation, outdoors, people, production, professional, project, railway engineer, repair, safety, service, site, station, system, technician, technology, tools, train, train station, transportation, work, worker, workshop,