名词
中文翻译：Unknown
同义词：
['midway track', 'midpoint track', 'middle track']
例句：
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1. The train's middle runnings are the most important part of its design.
火车的中间轨道是其设计中最关键部分。
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2.The construction of this bridge involved the middle runnings being replaced with steel beams.
这座桥梁的建设涉及到将中间轨道替换为钢梁。
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3. The engineer carefully measured the distance between the two middle runnings to ensure alignment.
工程师仔细测量了两个中间轨道之间的距离，以确保对齐。