空转轮：自由转动的，非扣片的卷轴，用于引导胶片通过正确的路径。

Idle Roller: Free turning non-sprocketed rollers for guiding film through its appropriate path.

youdao

空转轮：自由转动的，非扣片的卷轴，用于引导胶片通过正确的路径。

Idle Roller: Free turning non-sprocketed rollers for guiding film through its appropriate path.

youdao