universal-joint cap

例句：

1. 1. The doctor prescribed a universal joint cap to help him recover from his injury.
   医生给病人开了一个通用关节护膝，帮助他恢复伤势。
2. 2.He wore a universal joint cap during the game to protect his knee.
   比赛中，他戴着一个通用关节护膝来保护他的膝盖。
3. 3. The athletes used universal joint caps to prevent injuries while practicing.
   运动员们使用通用关节护膝来练习时防止受伤。