n.持续时间,间隔;跨度,墩距;范围;
v.持续;横跨,跨越;包括,涵盖;
例句:
Small children have a short attention span .
幼儿注意力持续时间短。
Managers have a wide span of control.
经理的职权范围很大。
...the humped iron bridge spanning the railway...
横越铁路的铁拱桥