rotary pair

例句：

1. 1. The rotary pair is responsible for the rotation of the disk.
   旋转对负责磁盘的旋转。
2. 2. In a rotary pair, the two parts rotate in opposite directions.
   在旋转对中，两个部分以相反方向旋转。
3. 3. The rotary pair is used to transmit power from one shaft to another.
   旋转对用于将一个轴的动力传输到另一个轴。