decay of luminescene

例句：

1. 1.The decline in the population is a concern for many experts.
   人口减少是许多专家的关注点。
2. 2. The decay of the ancient city ruins is fascinating to watch.
   古代城市遗迹的衰败令人着迷。
3. 3. The decay of the old building was evident in its structural weaknesses.
   旧建筑的衰败在结构弱点中显而易见。