工人们在新大楼周围搭建了脚手架，以便粉刷外墙。

Workers set up ___scaffolds around the new building to paint the exterior walls.

建筑师用3D模型作为脚手架来完善他的设计方案。

The architect used 3D models as ___scaffolds to refine his design.

这些3D打印的支架帮助受损神经组织再生。

These 3D-printed ___scaffolds help regenerate damaged nerve tissues.