reverse idler

例句：

1. 1. The engineerdesigned a reverse idler to improve theefficiency of the machine.
   工程师设计了一个反向惰轮，以提高机器的效率。
2. 2. In this case, the reverse idler is used toreduce friction between the two rotating parts.
   在这种情况下，反向惰轮被用来减少两个旋转部件之间的摩擦。
3. 3. The reverseidler was crucial inensuring smooth operation of the transmissionsystem.
   反向惰轮在确保传动系统平稳运行中起着关键作用。