Explain how easy it is to build a bridge to the pole from the ground up before. To the weight of the bridge Then the bridge was built on the pillars that have been made since the first.
How to create a simple explanation is that the bridge towers make up before the ground to receive the weight of the bridge and then take the bridge, build on the pillars that originally made.
Describe how easy it is to create a bridge pillars from the ground up before you get to the bridge, then take the weight of the bridge was built on the pillars of it from the first.