肘关节

例句：

1. 1. He stretched his arm to get a better view of the game.
   他伸展手臂以便更好地观看比赛。
2. 2. The doctor advised him to rest for a few days before starting his new job.
   医生建议他在开始新工作时休息几天。
3. 3. She moved her elbow to avoid hitting her friend's head.
   她移动肘部以避免撞到朋友的头。