double-cover butt joint

例句：

1. 1. The surgeon performed a double-layered butt joint replacement surgery on the patient.
   外科医生为患者进行了双层覆盖的臀部接合处置换手术。
2. 2.During the game, the players had to use their double-layered butt joints to move around quickly.
   在比赛中，球员们必须使用他们的双层覆盖的臀部接合处来快速移动。
3. 3.After the surgery, the patient's double-layered butt joints were carefully monitored for any signs of infection.
   手术后，患者被仔细监测其双层覆盖的臀部接合处是否有感染的迹象。