slip joint

例句：

1. 1. The car's engine has a slip joint that needs to be checked regularly.
   这辆车的引擎有一个需要定期检查的滑脱关节。
2. 2. The old man had a slip joint in his knee and couldn't walk without help.
   这位老人膝盖里有一处滑脱关节，没有帮助就无法走路。
3. 3. The doctor advised the patient to have the slip joint replaced as soon as possible.
   医生建议病人尽快更换滑脱关节。