Ключевые слова: air, arm, autumn, biological, biology, cabin, clock, collection, defence, direction, earth, energy, environment, frozen, green, health, healthy, icon, icy, minute, natural, nature, nautical, ocean, overcast, panel, planet, preserve, protection, radiation, roof, save, set, snow, snowfall, snowy, sprout, star, sunshine, temperature, underwater, warm, wave, web, wildlife,