Ключевые слова: blue sky, concentration, construction, control, daylight, effort, energy, engineering, environment, equipment, gas, gloves, handle, hard hat, heavy equipment, helmet, industrial, industry, infrastructure, job, labor, machinery, maintenance, man, manual, manual labor, manual work, mechanical, occupation, oil, operation, outdoor, physical, physical job, pipeline, pipes, profession, protective, safety gear, secure, skilled labor, steel, system, technician, turn, valves, worker, workforce, workwear, wrench,