龙骨墩

例句：

1. 1. The engineer designed the bridge to be strong enough to support heavy traffic.
   工程师设计这座桥足够坚固以承受重载。
2. 2. The old bridge was replaced with a new one after several years of wear and tear.
   经过几年的磨损，这座老桥被一座新桥所取代。
3. 3. The construction of the new bridge required extensive excavation work on the old site.
   建造这座新桥需要对旧址进行广泛的挖掘工作。