A concrete noun is a noun that refers to a physical object rather than to a quality or idea.
Concrete is a substance used for building which is made by mixing together cement, sand, small stones, and water.
The posts have to be set in concrete.
这些柱子必须固定在混凝土中。
We sat on the concrete floor.
我们坐在混凝土地板上。
concretes , concreting , concreted
When you concrete something such as a path, you cover it with concrete.
He merely cleared and concreted the floors.
他只是清理了地板并浇上了混凝土。