全长的英文：
span

参考例句：

The Yangtze River(Changjiang), 6,300 kilometers long, is the largest river in China.
长江是中国第一大河，全长6300公里

The three imposing gorges--Qutang, Wuxia and Xiling Gorges---extend 193 kilometers.
壮丽的三峡包括瞿塘峡、巫峡和西陵峡，全长193公里。

The Tour of Spain which covers 3753 kilometres is one of the Big three European Tours．
全长3753公里的环西班牙大赛是欧洲三大自行车赛事之一。

Across the length of the mural the River Wear moves from source to sea, through its natural and social landscape
画面上贯穿壁画全长的韦尔河穿过它的自然风光和社会风光，从源头流向大海。

span是什么意思：
n. 跨度；范围；一段时间
v. 以指测量；以掌测量；跨越；持续

They spanned windows with bricks.
他们在窗子上用砖砌了拱顶。

a memory [attention] span
记忆 [注意力] 持续的期间[时间]

span a river with a bridge
在河上架桥

He spanned his wrist.
他握住手腕部量量看有多粗。

He has a short attention span.
他的注意力持续时间短。