special joint

例句：

1. 1. This special joint allows for easy movement and reduces friction.
   这个特殊的关节使得运动容易且减少摩擦。
2. 2. The scientist discovered a new way to connect the two parts of the robot.
   科学家发现了一种连接机器人两部分的新方法。
3. 3. The special joint was designed to withstand high pressure and temperature changes.
   这种特殊关节被设计来承受高压和温度变化。