Ключевые слова: abstract, background, banner, blue, caution, danger, drug, ecology, environment, environmental, field, forbidden, fresh, garden, grass, green, health, information, isolated, keep, lawn, nature, nobody, not, notice, off, out, outdoor, outdoors, park, plant, please, post, prohibit, recycle, red, restricted, road, sign, sky, summer, symbol, the, walk, walking, wall, warning, white, yard,