With a length of over 35 miles, the world's longest train tunnel should become operational at the end of 2017.
这个隧道全长35英里，是世界上最长的火车山体隧道，预计将在2017年年底通车。
With a length of over 35 miles, the world's longest train tunnel should become operational at the end of 2017.
这个隧道全长35英里，是世界上最长的火车山体隧道，预计将在2017年年底通车。
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