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n (1)跨距 (徑) (bridge's or arch's length between its supports)[C]：the second～of the bridge 橋的第二孔;a bridge of four～s 四孔橋;The middle～of the bridge is one hundred feet long. 這座橋的中間一孔跨距為100英尺。The arch has a～of 40 metres. 這道拱門的跨距為40米。The bridge crossed the river is a single～. 河上那座橋是單孔橋。〖同〗arch，archway，wing，extension;

(2)(一段持續(xù)的)時間(period or length of time over which sth continues or lasts)[C]：over a～of eight years八年期間;a short～of time 一段短時間;His～of life is over. 他的一生結(jié)束了。a concentration/attention/interest/memory～集中注意力/注意/興趣/記憶持續(xù)的時間;

(3)指距，一拃寬(distance between the tip of the thumb and the tip of the little finger when the hand is fully extended)[C](舊用法)：measure by～s 用拃量;

vt(1)橫跨，跨越(provide with sth that extends over)[T+n]：～a river with a bridge 在河上架橋;A bridge～ned the river/the railroad/the bay. 一座橋跨越在河/鐵路/海灣上。An overpass～ned the centre of the town. 一座立交橋跨越鎮(zhèn)中心。The river is～ned by many bridges. 這條河上架有許多橋梁?！纪絙ridge，cross;

(2)貫穿，持續(xù)(extend，reach or pass over(space or time))[T+n](fml)：Her knowledge/interests～ned many areas (subjects). 她的知識/興趣涉及許多領(lǐng)域(學(xué)科)。His life～ned the whole of the 18th century. 他的一生跨過了整個18世紀(jì)。His career～ned three decades. 他的事業(yè)持續(xù)了30年。Their friendship～ned a lifetime. 他們的友誼保持了一生?！玜ll professions 包括各行各業(yè);〖同〗cover，last，endure，survive;

(3)以指量距(測量)(stretch one's extended hand over or across in one span)[T+n]：～the intervening space 測量間隔的距離;～an octave on the piano 一拃按鋼琴的八個鍵;

【注意】此字和 spin 的過去式 span 讀音、拼寫相同。