Ключевые слова: abstract, background, barb, barrier, border, boundary, cage, chain, construction, country, danger, dangerous, design, enclosure, engineering, fence, field, forbidden, freedom, gardening, grass, green, grid, industrial, iron, jail, link, mesh, metal, metallic, military, net, outdoor, outside, pattern, precaution, prevention, prison, protection, safety, security, sky, steel, texture, tube, wall, wire,