free-running revolutions

例句：

1. 1. The new car has a free-running engine that makes it more fuel-efficient.
   这款新车有一个无摩擦运转的发动机，使其更加省油。
2. 2. The robotic arm is designed to perform free-running revolutions in the factory.
   这个机器人手臂被设计成在工厂中进行无摩擦运转的旋转工作。
3. 3. In the free-running revolutions, the planets revolve around the sun without friction.
   在无摩擦运转的旋转中，行星围绕太阳运行而没有摩擦。