求翻译：卢浦大桥是当今世界第一钢结构拱桥，是世界上跨度最大的拱形桥。大桥主桥为全钢结构，大桥全长3900米，其中主桥长750米，宽28.75米，采用一跨过江，由于主跨直径达550米，居世界同类桥梁之首，被誉为“世界第一钢拱桥”。是什么意思？

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The Lu water's edge bridge is now the world first steel structure arched bridge, is in the world the span biggest arch bridge.The bridge main span is all steel structure, the bridge span 3900 meters, in which main span length 750 meters, the width 28.75 meters, uses cross one crosses the river, beca

Lupu bridge is the world's first steel arch bridge, is the largest arch bridge span in the world. For the whole steel structure of main bridge, the bridge is 3,900 metres, of which 750 metres of main, 28.75 meters wide, crossing the River, because the main span of up to 550 meters in diameter, head

The steel-structured arch bridge of the first in the world that Lupu Bridge is current, it is the largest arcual bridge of span in the world. The main bridge of the bridge is the whole steel construction, the bridge total length is 3900 meters, among them the main bridge is 750 meters long, 28.75 me