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girder with rolled steel section encased in concrete, skeleton reinforced concrete girder

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[铁道科技英汉词典]

girder with rolled steel section encased in concrete, skeleton reinforced concrete girder
型钢混凝土梁
又称“劲性骨架混凝土梁”。

是什么意思，girder with rolled steel section encased in concrete, skeleton reinforced concrete girder的解释，girder with rolled steel section encased in concrete, skeleton reinforced concrete girder的翻译