Ключевые слова: activity, building, busy, concept, construction, crowd, danger, dig, digger, ditch, effort, energy, engineering, equipment, excavate, excavation, fence, hardhat, helmet, job, looking, machinery, manual, manufacturing, metal, metalwork, metalworker, net, occupation, partnership, people, pipe, pipeline, project, protective, safety, site, skill, symbol, task, team, teamwork, together, tool, trench, tube, welder, welding, work, worker,