a cement floor的用法和样例：
- Then Rutherford, in his unassuming white coat, made a last minute inspection tour round his laboratory, a high and wide room with a cement floor.
- The cement floor has been stiffened.
- The glass fell on the cement floor and broke up.
- A cement mixture used to waterproof outer walls.
- The glasses fell on the cement floor and broke up.
- The specs fell on the cement floor and broke up.