floor是可数名词。
floor：n.地板；地面；(车厢内的)底板；楼层；v.使惊奇；使困惑
His work was spread all over the floor.
他工作的材料摊了一地。
There is a fire exit on each floor of the building.
这栋建筑每层楼都有个消防通道。
The alterations should give us extra floor space.
这些改动应该使我们有更大的居住面积。
温馨提示：
