短語詞組短語curve of turnout lead curve 導曲線turnout curve behind frog 道岔隨附曲線double curve turnout 繙譯;雙開道岔英語;雙開道岔unsymmetrical double curve turnout 偏開道岔;單式不對稱道岔;不對稱雙開道岔symmetrical double curve turnout 雙開道岔;單式對稱道岔curve of turnout 導曲線Second curve of turnout 道岔附曲線curve following turnout branch line 道岔附帶曲線curve following turnout division line 道岔附帶曲線 返回 turnout curve