Ключевые слова: adult, adults only, bulldozer, business, coal, coal mine, coal miner, coalition, construction, digging, dirty, energy, engineer, engineering, environment, environmental, excavation, exploration, explorer, factory, fossil fuel, fuel and power generation, geology, hard hat, heavy, helmet, horizontal, industrial, industry, job, machine, machinery, man, manufacturing, material, men at work, mine, miner, mineral, mining, occupation, ore, outdoor, power, production, quarry, safety, shoveling, site, teamwork, technology, work, worker, working,