free-wheeling mechanism

例句：

1. 1.The new car has a free-wheeling mechanism that makes it easy to start and stop.
   这款新车有一个自由轮机制，使得启动和停止变得很容易。
2. 2.The engineer designed the free-wheeling mechanism to improve efficiency.
   工程师设计了自由轮机制，以提高效率。
3. 3. The free-wheeling mechanism is responsible for reducing friction and improving performance.
   自由轮机制负责减少摩擦并提高性能。