useful space

例句：

1. 1. The company has allocated a significant amount of useful space for new projects.
   该公司为新项目分配了相当多的可用空间。
2. 2.In the future, we need to find more efficient ways to use our available space.
   未来，我们需要找到更高效地利用我们可用空间的方法。
3. 3. The engineer calculated the useful space required for the project based on the data provided.
   工程师根据提供的数据计算了该项目所需的有效空间。