Idle Roller: Freeturning non-sprocketed rollers for guiding film through its appropriate path.
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。
2
Bradford decided to assign a plot of land to each family to work and manage, thus turning loose the power of free enterprise.
布拉德福德决定给每家每户一小块地皮，让他们去耕作，这一举动放宽了自由企业。
3
Red Hat's distribution, Red Hat Enterprise Linux, is comprised of free and open source software (FOSS) and they've been turning a profit for some time doing so.