世界上跨径（550米）最大的拱形桥，大桥主桥为全钢结构的翻译：Span in the world (550 m) the largest arch bridges, bridge steel structures 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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Span in the world (550 m) the largest arch bridges, bridge steel structures

In the world the span (550 meters) the biggest arch bridge, the bridge main span is all steel structure

正在翻译，请等待...

Span in the world (550 m) the largest arch bridges, bridge steel structures