railway coupling

例句：

1. 1. The railway coupling is the point where two tracks meet.
   铁路接头是两条轨道交汇的地方。
2. 2. The engineers carefully checked all the railway couplings before starting the project.
   工程师们仔细检查了所有铁路接头后才开始这个项目。
3. 3. The railway coupling was responsible for ensuring the safety of the trains.
   铁路接头负责确保火车的安全。