Ключевые слова: background, bag, bags, barrier, big, blue, building, color, construction, day, earth, environmental, excavate, excavation, global, ground, group, heap, image, industrial, industry, land, lot, lots, many, mound, mountain, natural, nature, outdoor, pattern, perspective, pile, prevention, protection, quarry, sacks, safety, sand, sandbag, sandbags, season, security, sign, sky, stack, wall, warming, white, yellow,