名词
中文翻译：单轨
同义词：
['single-track', 'single-track system']
例句：
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1.The train was onetrack on the mountainside.
火车在山边是单轨的。
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2.The engineer had to fix the onetrack track.
工程师必须修理单轨轨道。
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3.The construction of the new bridge will eliminate the need for onetrack tracks.
新桥的建设将消除单轨轨道的需求。