名词
中文翻译：Unknown
同义词：
['unfastened rail', 'unsecured rail']
例句：
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1.The engineer had to replace the unfastened rail on the bridge.
工程师不得不更换桥梁上未固定的钢轨。
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2. The train was delayed due to an unsecured rail in the tracks.
火车因轨道中的未固定钢轨而延误。
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3.The construction crew needed to tighten the unfastened rails before they could continue work.
施工队在继续工作之前需要拧紧未固定的钢轨。