Ключевые слова: coal, construction, dark, digging, dim, dimly, drill, duty, environment, equipment, excavation, exploration, extract, gear, geology, hard, hats, headlamps, heavy, helmet, industrial, industry, job, labor, laborers, light, lit, machinery, manual, mine, mineral, miners, mining, ore, professional, protective, rock, rugged, safety, shaft, teamwork, terrain, tunnel, two, underground, work, workers,