grease seal

例句：

1. 1.The oil seal on the door is worn out.
   门上的油封磨损了。
2. 2.The grease seal on the hinges needs to be replaced.
   铰链上的油脂密封需要更换。
3. 3.The grease seal helps to prevent leaks in the pipeline.
   油脂密封有助于防止管道泄漏。