on-board rail lubricator

例句：

1. 1.The on-board rail lubricator is essential for maintaining the smooth operation of the aircraft's engine.
   机载轨道润滑器对于保持飞机引擎的平稳运行至关重要。
2. 2.The on-board rail lubricator was designed to prevent corrosion and wear on the aircraft's metal components.
   机载轨道润滑器被设计用来防止飞机金属部件的腐蚀和磨损。
3. 3.The on-board rail lubricator was tested before launch to ensure it would function correctly during the flight.
   在发射前，对机载轨道润滑器进行了测试，以确保它在飞行过程中能够正确工作。