名词
中文翻译：副轨基础
同义词：
['sub-track foundation', 'sub-rail skeleton']
例句：
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1.The new sub-rail foundation is designed to improve the stability of the bridge.
新的副轨基础被设计用来提高桥梁的稳定性。
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2.The construction of the sub-rail foundation was completed ahead of schedule.
副轨基础的建设提前完成了。
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3. The engineers carefully laid down the sub-rail foundation before starting the main track construction.
工程师们小心翼翼地铺设了副轨基础，以便开始主轨道的建设。