可以看到桥梁内部的钢筋。

The bridge's internal ___rebar is visible.

工人们正在将钢筋绑扎成网格，为浇筑混凝土做准备。

The workers are tying the ___rebar into a grid before pouring the concrete.

工人们用钢筋加固混凝土柱以确保建筑安全。

The workers used ___rebar to strengthen the concrete columns for building safety.