spans

1. [C] 跨度,跨径 distance or part between the supports of an arch or a bridge
2. [C] 两个界限间的距离 a stretch between two thing, especially in time; period
3. [C] 一段时间 a length of time over which the stated thing continues or works well

• have a span of有…长〔宽〕
• lengthen〔shorten〕 the span延长〔缩短〕时间
• widen the span of knowledge扩大知识面

• brief〔short〕 span短暂的时间
• whole span全长

• attention span注意力持续集中的时间
• life span寿命
• memory span记忆持续时间

• measure by spans用指距来量
• in a span在一段时间中
• 100 feet in span跨距一百英尺
• bridge of three spans三孔桥
• over a span of在…之中

• span of a bridge桥的跨度
• span of knowledge知识面
• span of life寿命
• span of memory记忆的广度
• span of ten years十年的时间

life span寿命；使用期限

long span长跨度

time span时间跨度

span length跨度距离；杆间距离

attention span注意广度；注意力的持续时间

long span bridge长跨桥；大跨径桥

single span单跨；单孔

bridge span桥跨

spick and span崭新的，极干净的

memory span记忆广度；存储器容量

digit span数字广度

clear span净跨；净孔；净翼展

wing span翼展；翼层

1. Modern medicine has increased man's life span.
   现代医学延长了人的寿命。
2. 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。
3. The arch has a span of 60 meters.
   拱门的跨度为60米。
4. The spider has a leg span of 3 inches.
   这个蜘蛛的腿的长度为3英寸。
5. 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。

1. The shipwrecks span nearly a century.
   这些船只残骸已有近百年历史。
2. Little bridges span the canals.
   小型的桥梁横跨在运河之上。
3. The gloom spans the whole novel.
   阴郁的气氛贯穿着整部小说。
4. His knowledge spans many different areas.
   他的知识遍及许多领域。
5. Imagination will span the gaps in our knowledge.
   想像力会弥补我们知识的不足。