a heavy, rough building material made from a mixture of broken stone or gravel, sand, cement, and water, that can be spread or poured into molds and that forms a mass resembling stone on hardening.
slabs of concrete
动词
1
cover (an area) with concrete.
the precious English countryside may soon be concreted over
2
form (something) into a mass; solidify.
the juices of the plants are concreted upon the surface
