Ключевые слова: activity, alternative energy, arm, beam, bending, chain, chain saw, chainsaw, concentration, cutting, deforestation, equipment, expertise, firewood, forest, gasoline, helmet, horizontal, human, industry, job, laborer, log, lumberjack, machine, machinery, men, nature, occupation, one person, outdoors, person, petrol, power tool, protection, protective, risk, safe, safety, saw, sawing, standing, timber, tree, tree trunk, wood, wood material, worker, working, workwear,