Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.

高架桥的水泥柱先前只是在内部埋设钢条，如今外面也包上了钢板。

youdao

Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.

高架桥的水泥柱先前只是在内部埋设钢条，如今外面也包上了钢板。

youdao