It's a bridge of steel framework.

那是座钢铁结构的桥梁。

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This is a bridge with a steel framework.

这是一座钢结构的桥。

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This bridge over the river has a steel framework.

这座跨江大桥是钢骨结构。

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This bridge over the river has a steel framework.

这座跨江大桥是钢骨结构。

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