英语高手请指教！fragrance 怎么区分aroma

fragrance

n.
The state or quality of having a pleasant odor.
香气有悦人的味道的状态或性质
A sweet or pleasant odor; a scent.
芳香甜甜的或悦人的味道；香味
fragrance aroma bouquet perfume redolence scentThe central meaning shared by these nouns is 揳 pleasant or sweet odor?
the fragrance of lilacs;
紫丁香的芳香；
the aroma of sizzling bacon;
嘶嘶作响的熏猪肉的香味；
the bouquet of a fine Burgundy wine;
优质勃艮第葡萄酒的香味；
the perfume of roses;
玫瑰的芳香；
the redolence of freshly brewed coffee;
新煮的咖啡的浓郁香味；
the scent of newly mown hay.
刚割下的干草之香气。

aroma
n.
A quality that can be perceived by the olfactory sense:
气味一种可被嗅觉感受到的特性：
the aroma of garlic and onions.
大蒜和洋葱的气味
See: smell
A pleasant characteristic odor, as of a plant, spice, or food:
芳香一种有令人舒适特性的气味，如植物，香料或食物：
the aroma of roses.
玫瑰的芳香
See: fragrance
A distinctive, intangible quality; an aura:
气氛一种特殊的，触摸不到的特性；