The improvement in efficiency was, admittedly, quite small (about half a percent), but the space saving was significant—almost 16%.

诚然，效率提高非常有限（提高约0.5%），而空间节省面积却很高，减少近16%。

One space saving solution that's gaining ground, vertical cemeteries.

一种正在普及的节省空间的解决方案，垂直墓地。

The elevator system was intended to be fast, efficient, and space saving.

电梯系统旨在快速、高效和节省空间。