available surface

例句：

1. 1. The new building has a large available surface for parking.
   这座新建筑有一大片可供停车的可用面积。
2. 2.The engineer calculated the available surface of the land for construction.
   工程师计算了这片土地可用于建设的最大可用面积。
3. 3. The company plans to expand its available surface by adding more warehouses.
   该公司计划通过增加更多的仓库来扩大其可用面积。