Ключевые слова: boiler, charcoal, coal, cognition, crew, dark, engineer, engineering, explain, firewood, gas, grubby, guidance, hand, help, industrial, industry, instruction, iron, machinery, machinery factory, made, manufacturing, metal, natural, occupation, oil, old, orientation, over, pipe, pressure, room, shovel, smile, smoke, steamer, stoker, team, teamwork, technical, technician, technology, temperature, tube, tubing, work,