freewheeling arm

例句：

1. 1.The engineer designed a freewheeling arm to increase efficiency.
   工程师设计了一个自由轮臂来提高效率。
2. 2. The car's freewheeling arm was damaged during the accident.
   汽车的自由轮臂在事故中受损。
3. 3.The new design uses a freewheeling arm to reduce friction and improve performance.
   新设计使用了自由轮臂来减少摩擦并提高性能。