Ключевые слова: black, cavern, coal, copyspace, dirt, dirty, dust, employment, energy, engineer, engineering, face, foreman, grime, hard, hardhat, hat, head, helmet, industrial, industry, inspector, job, labor, laborer, lung, machinery, male, man, men, mine, miner, occupation, occupational, one, orange, people, person, profession, quality, safety, site, skill, soot, thought, thoughtful, union, work, worker,