Ключевые слова: blood, business, construction, copper, danger, energy, engineer, engineering, fuel, gold, grid, hard, hard hat, hardhat, helmet, industrial, industry, light, line, man, many, metal, mine, miner, mineral, mining, old, orange, ore, pit, power, process, processing, production, productivity, recovery, rough, safety, supervisor, survey, tears, technology, tin, tunnel, underground, united, wealth, worker, workforce,