Ключевые слова: abstract, april, background, banner, business, care, clean, concept, day, design, doctor, earth, eco, ecology, ecosystem, environment, environmental, flat, global, globe, green, hand, happy, health, health care, healthy, hospital, icon, illustration, international, isolated, leaf, life, medical, medicine, natural, nature, planet, plant, poster, protection, recycle, save, science, symbol, tree, water, white, world,