Engineers superimpose the original CAD models over actual buildings to determine which bits of the model need to be updated, or which parts of the building need to be rebuilt.

• 工程师们将原始的CAD模型叠印于实际的建筑上，以此来定夺模型的哪个部分需要被改进，或者建筑的哪个部位需要被重建。