Ключевые слова: background, black, book, business, close up, concept, ecological, ecology, education, educational, environment, foliage, grass, green, grow, growing, growth, hardcover, knowledge, leaf, learn, learning, library, life, light, literature, magic, natural, nature, note, open, paper, plant, ray, read, sapling, school, science, seedling, shiny, space, sprout, textbook, training, tree, up, white, wisdom, world,