long wave undulation of rail head

例句：

1. 1. The long wave undulation of the rail head is a crucial factor in the stability of the railway system.
   铁路头部的长波波动是铁路系统稳定性的关键因素。
2. 2.The engineer studied the long wave undulation of the rail head to optimize the design of the train's suspension system.
   工程师研究了铁路头部的长波波动，以优化火车悬挂系统的设计方案。
3. 3.The long wave undulation of the rail head has a significant impact on the performance of the railway system.
   铁路头部的长波波动对铁路系统的性能有显著影响。