Ключевые слова: adult, coal, coal mine, coal miner, czech republic, digger, digging, earth mover, energy, engineer, engineering, environment, environmental issues, europe, excavator, fossil, fossil fuel, fuel, geology, hardhat, heavy, helmet, industrial, industry, job, large, machinery, man, mine, miner, mining, nature, occupation, open pit, openpit mine, people, person, pollution, power, production, protection, quarry, quarrying, rear view, safety, surface mine, technology, work, worker, working,