ageing of asphalt

例句：

1. 1. The elderly need more care andattention than younger people do.
   老年人需要更多的照顾和关注。
2. 2. The aging process is inevitablefor all living things.
   所有生命体都无法避免老化过程。
3. 3. The aging of the cityhas led to many changes in its infrastructure.
   城市的老化导致了基础设施的许多变化。