求翻译：A Swiss doctor Auguste Rollier, made full use of the sun in hospital at Leysin. Leysin is a small village high up in the Alps. The position is important: the rays of the sun with the greatest healing power are the infrared(红外线的) and ultraviolet(紫外线的)rays: but ultraviolet rays are too easily lost in fog and the polluted是什么意思？

待解决 悬赏分：1 - 离问题结束还有