n.时期；跨度；间距
vt.延续；横跨；贯穿；遍及；弥补
动词spin的过去式形式.
Modern medicine has increased man's life span. 现代医学延长了人的寿命。
He has settled here for a long span of time. 他已经在这儿定居很长一段时间了。
The arch has a span of 60 meters. 拱门的跨度为60米。
The spider has a leg span of 3 inches. 这个蜘蛛的腿的长度为3英寸。
The clear span of a bridge is the gap from the near edge of the next. 桥梁的净跨，是自一个桥墩的近侧边到相邻桥墩近侧边之间的间距。
用作及物动词 (vt.)The shipwrecks span nearly a century. 这些船只残骸已有近百年历史。
Little bridges span the canals. 小型的桥梁横跨在运河之上。
The gloom spans the whole novel. 阴郁的气氛贯穿着整部小说。
His knowledge spans many different areas. 他的知识遍及许多领域。
Imagination will span the gaps in our knowledge. 想像力会弥补我们知识的不足。
