The higher the altitude, the more difficult the conditions for survival, and the thinner the protective atmosphere. But the intense ultra-violet rays enhance the flowers 'splendor--they are never as pale as the cultivated rhododendron s of the cities.
海拔越高，生存條件越惡劣，保護層越少，但強烈的紫外線，卻加深了花的容顏，絕沒有定居都市杜鵑的蒼白。