修复古桥时，工人先测量了两侧半拱的弧度，再按原样制作石块。
While restoring the old bridge, the workers first measured the curvature of the half arches on both sides and then made the stones to match the original.
While restoring the old bridge, the workers first measured the curvature of the half arches on both sides and then made the stones to match the original.