名词
中文翻译：Unknown
同义词：
['double-track tunnel', 'double-rail tunnel', 'double-track tunnel']
例句：
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1.The double-line tunnel is a crucial part of the transportation network.
双层隧道是交通网络中至关重要的一部分。
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2. The double-line tunnel was built to improve traffic flow and reduce congestion.
双层隧道的建造是为了改善交通流量并减少拥堵。
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3.The double-line tunnel is used for both passenger and freight transport.
双层隧道既用于客运也用于货运。