Large-span prestressed concrete grillage girder frame st ructures have proved to be the effective application of the prestressing technol ogy to the grillage girder frame structure.是什么意思_Large-span prestressed concrete grillage girder frame st ructures have proved to be the effective application of the prestressing technol ogy to the grillage girder frame structure.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句