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Ключевые слова:
afforestation, air, autumn, biology, botanic, branched, chlorophyll, ecology, ecosystems, environmental protection, fall, filter, flora and fauna, forest, fresh, green, ground, growing up, high, leaf, lung, moss, natural environment, nature, oak, oxygen, photosynthesis, plant, pure, roots, seasons, sky, spread, spring, surface, tree, tree roots, tree trunk, twigs, vegetation, wood, wooded area,