Ключевые слова: car, cave, cavern, dark, deep, dig, digger, discovery, engineering, equipment, excavate, excavated, excavation, exploration, export, extract, extraction, geology, gold, golden, hard, heavy, indoor, industrial, industry, inside, job, light, load, machine, machinery, mine, mineral, modern, ore, production, resources, rock, stone, transportation, truck, tunnel, tunneling, underground, vechicle, vehicle, way, work,