He goes on to recount how the allure of emeralds and rubies is provided by chromium , which not only colours the stones but also fluoresces with red light , so that the best gems appear to flicker with inner fire .

他接着详述了绿宝石和红宝石的魅力是由铬元素提供的，铬元素不仅增添了石头的颜色，也发出红色荧光，以致最好的宝石都若隐若现地自内散发光芒。

Nocturnal crawler , a scorpion remains well camouflaged under a flash-light 's beam , but fluoresces in ultraviolet light [ as seen here ] , a reaction that remains a mystery to scientists .

夜间活动的爬行动物蝎子在手电筒的光照下仍充分保持伪装，但是就像这张相片所显示的一样，蝎子在紫外线光照下却发出荧光，这种反应对科学家来说仍旧是个谜。