Ключевые слова: air, allergens, anatomy, background, beautiful, biology, blue, breath, breathe, breathing, breathing fresh air, cancer, care, cloud, clouds, cloudscape, cloudy, cotton wool, day, ecology, environment, fluffy, fog, fresh, gas, health, healthy, human, life, light, lung, lungs, natural, nature, organ, oxygen, pneumonia, protect, protection, save, shape, shaped, sky, smoke, smoking, symbol, tuberculosis, white, wind, world,