The span between two such diaphragm walls can easily be bridged with precast reinforced concrete beams or a cast in-site reinforced concrete slab to complete the main shell of the tunnel.是什么意思_The span between two such diaphragm walls can easily be bridged with precast reinforced concrete beams or a cast in-site reinforced concrete slab to complete the main shell of the tunnel.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句