岔心后方曲線 turnout curve: 道岔曲度curve of turnout lead curve: 導(dǎo)曲線turnout curve behind frog: 道岔隨附曲線unsymmetrical double curve turnout: 偏開道岔curve following turnout branch line: 道岔附帶曲線下載手機(jī)詞典可隨時隨地查詞查翻譯