Derived from an effective combination of space truss and portal frame, a novel long-span structure named lattice portal frame (LPF) is put forward.是什么意思_Derived from an effective combination of space truss and portal frame, a novel long-span structure named lattice portal frame (LPF) is put forward.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句