动关节

例句：

1. 1. The doctor advised him to exercise regularly to maintain his joint health.
   医生建议他定期锻炼以保持关节健康。
2. 2. The scientist discovered a new way to manipulate the joints of living organisms.
   科学家发现了一种操纵活体生物关节的新方法。
3. 3. The dancer's movements were so precise that they could hardly be distinguished from the natural movement of the joints.
   舞者的动作如此精确，以至于几乎无法与自然关节的运动区分开来。