Ключевые слова: activity, alone, build, construction, construction site, contractor, delivering, dig, drilling, ecology, energy, engineering, forest, fuel, gas, gas pipe, gasoline, industrial, industry, installation, installing, job, landscape, laying, line, liquid, long, longest, machine, natural, natural gas, oil, pipe, pipeline, piping, plant, refinery, russia, safety, soil, steel, surface, technology, transportation, tree, trees, tube, underground, underground pipes, work,