tightening idler

例句：

1. 1. The machine's idler is loose, causing the machine to run poorly.
   机器的惰轮松了，导致机器运行不良。
2. 2. The idler was designed to reduce friction and improve efficiency.
   惰轮的设计是为了减少摩擦并提高效率。
3. 3. The idler is responsible for transferring power from the motor to the gears.
   惰轮负责将动力从马达传递到齿轮。