Slabs of concrete had been used to build a pathway for people to walk on.大块的水泥板用于铺设人行道。The wall is built with precast concrete panels.这堵墙是用预制水泥板建的。They used a slab of concrete as a lid.他们用一块水泥板当盖子。A security perimeter of concrete blocks and barbed wire has been set up.用水泥板和带刺铁丝网搭建起了安全围栏。