lubricating oil filling pipe

例句：

1. 1. The lubricating oil filling pipe is essential for the smooth operation of the machine.
   润滑油填充管对于机器的顺畅运行至关重要。
2. 2.The engineer carefully inspected the lubricating oil filling pipe to ensure it was in good condition.
   工程师仔细检查润滑油填充管，确保其处于良好状态。
3. 3. The lubricating oil filling pipe was used to prevent friction between the moving parts of the machine.
   润滑油填充管用于防止机器移动部件之间的摩擦。