Ключевые слова: background, block, bright, building, calendar, celebration, concept, construction, december, equipment, happiness, happy, holiday, idea, industrial, industry, job, line, little, machine, metal, miniature, moving, new, people, project, protection, rail, railroad, railway, road, safety, service, stack, steel, team, teamwork, tiny, toy, track, train, transport, transportation, way, wood, wooden, work, worker, year,