Hooke's (universal) joint

例句：

1. 1. The doctor advised him to take care of his joints.
   医生建议他要好好照顾关节。
2. 2. The scientist discovered a new type of joint that could be used in robotics.
   科学家发现了一种新型关节，可以在机器人技术中使用。
3. 3. The old man had to use his hands and joints to move around.
   老人不得不用手和关节来移动。