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I think the idea is that they are building each floor on the ground level then lifting the entire floor up to place in one go rather than having to build the floors at height lifting all of the materials and workers and lower the waste as they go.
I think the idea is that they are building each floor on the ground level then lifting the entire floor up to place in one go rather than having to build the floors at height lifting all of the materials and workers and lower the waste as they go.