oil tightness

例句：

1. 1. The engine wasdesigned to operate smoothly without any oil tightness issues.
   这款发动机设计得非常光滑，没有油膜密封问题。
2. 2. The newvalve design ensures that the oil tightnessis maintained at all times.
   新的阀门设计确保了油膜密封始终得到保持。
3. 3.During the maintenance, the technician found asmall leak in the oil tightness ofthe bearing.
   在维护期间，技术人员发现轴承的油膜密封处有微小泄漏。