Ключевые слова: activity, basement, concentration, construction, craftsmanship, darkness, dim, electricity, energy, environment, equipment, evening, focus, hands, illumination, industry, infrastructure, installation, laboratory, laborer, light, machinery, maintenance, manual, mechanical, operations, plumbing, professional, project, repair, residential, safety, service, setting, skill, skilled, solitary, solitude, space, systems, task, technician, tools, trade, tradesman, underground, warm, work, worker, workshop, workspace,