For me. I think the challenge is to create structures in the sea, which must take into account, in so many ways, and many people might think that it is difficult to construct, but currently this can be a simple affair to do it. , There is nothing difficult for engineers.Bridge construction on the water, this requires knowledge in many aspects together. Which structure in the water is more than complicated structures on land.Where is sara a large bridge and this definitely requires a lot of construction workers and require a lot of materials as well.
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