steel in the form of bars or a mesh (= wires that cross over each other), put inside concrete to make it stronger

The concrete is reinforced with steel rebar. 混凝土用钢筋加固。

Inspectors surveyed both levels of the structure, looking for exposed rebar, loose bits of concrete, or cracks. 检查人员勘察了这栋两层建筑的每个楼层，寻找暴露的钢筋、松动的混凝土块或裂缝。