Ключевые слова: army, backdrop, background, bag, barricade, barrier, boundary, building, closeup, construction, dam, danger, defense, design, dike, disaster, environmental, flood, global, gray, grey, group, heap, heavy, levy, many, military, natural, nature, pattern, pile, protect, protection, rough, sack, sackful, safety, sand, sandbag, security, shelter, stack, storm, structure, texture, wall, war, water, white,