As box structure is employed as inner form of cast-in-situ concrete slab to form hollow two-way slab,the slab deadweight is greatly reduced.是什么意思_As box structure is employed as inner form of cast-in-situ concrete slab to form hollow two-way slab,the slab deadweight is greatly reduced.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句