short wave undulation of rail head

例句：

1. 1. The engineer was monitoring the short wave undulation of the rail head to ensure safety during the construction.
   工程师正在监测铁路头部的短波振动，以确保施工期间的安全。
2. 2. The train's engine was producing a short wave undulation that caused the wheels to skip.
   火车引擎产生的短波振动导致车轮跳动。
3. 3. The research team found that the short wave undulation of the rail head could be used toimprove the train's performance.
   研究团队发现，可以通过调整铁路头部的短波振动来提高列车的性能。