upper span的意思|示意

The cable is the important component of suspension bridge. Determination of initial states of cable of large span suspension bridge is the key part of the upper structure construction.

主缆是悬索桥的重要受力构件，精确计算其空缆线形是悬索桥上部结构施工成败的关键。

Finally two glass boxes span between the deck and roof, and the natural granite topography. These enclose the winter living areas at the upper level and the master bedroom suite at the lower level.

最后，两个玻璃箱跨在甲板和屋顶之间，加上天然花岗岩地形，这些围住了上层的冬季生活区和底层的主卧套房。

The upper level is a separate white cube, cantilevering over a big span.

上层是个单独的白色立方体旋臂，左右跨幅大。