短語(yǔ)詞組短語(yǔ)unsymmetrical double curve turnout 偏開(kāi)道岔;單式不對(duì)稱道岔;不對(duì)稱雙開(kāi)道岔symmetrical double curve turnout 雙開(kāi)道岔;單式對(duì)稱道岔 返回 double curve turnout