The paper gives a brief introduction on structure, constitution of main equipment and systematic functions of CTC system of Batong line in Bejing metro.是什么意思_The paper gives a brief introduction on structure, constitution of main equipment and systematic functions of CTC system of Batong line in Bejing metro.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句