mainshaft bearing retainer

例句：

1. 1. Theengine's mainshaft bearing isworn out, which affects the performance ofthe engine.
   发动机的主轴轴承磨损了，这影响了发动机的性能。
2. 2. Maintaining the proper condition ofthe mainshaft bearing iscrucial for the longevity ofthe engine.
   保持主轴轴承的良好状态对发动机的持久性至关重要。
3. 3. The technician replacedthe mainshaft bearing retainer andchecked the oil level to ensure the enginewas running smoothly.
   技术人员更换了主轴轴承保持器并检查了油位，以确保发动机运行顺畅。