Over the past five years,construction of 5,944 km of new railway lines,of which 4,603 km are double-track and 5,704 km are electrified,was completed.是什么意思_Over the past five years,construction of 5,944 km of new railway lines,of which 4,603 km are double-track and 5,704 km are electrified,was completed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句