这句话仔细看,应该是花在窗台上,太阳射进来的时候,这些花的香气飘散开来,显得很浓郁.
“照射”、“美丽的”、“浓郁的芬芳”这几个词组都可以有很多种不同的说法,看作者（译者）个人的偏爱了：
照射：shine on,shed on,cast on,pour forth,sprinkle over,scatter on/over,throw,etc.
美丽的：beautiful,fine,pretty,stunning,charming,splendid,exquisite,wonderful,delicate,delightful,beauteous,etc.
浓郁的芬芳：intens,full-bodied,heady,mellow,heavy,matured,strong,intoxicating,overwhelming etc.
整句可以有多种翻译：
The lovely flowers on the windowsill smelled sweeter when the sun shed on them.
The beautiful flowers on the windowsill started to give off such a overwhelming scent when shed by the sunshine.
The moment when the sun poured forth its flame,the beauteous flowers on the windowsill exuded rich and pleasant aroma.
