短語詞組短語unsymmetrical side -span 不對(duì)稱邊跨ratio of side -span to 分跨比high and large side -span 高大邊跨side span support 邊跨支撐long side span 大邊跨side span column 邊跨柱side span WESTBANK 側(cè)孔ballast on side span 邊跨壓重connection side span 連接邊節(jié)距 返回 side span