他慢慢松开卷轴上的绳子，以便测量长度。

He slowly ___unreeled the rope from the spool to measure its length.

放映员正在为孩子们放一部老动画片。

The projectionist is ___unreeling an old cartoon for the children.

老人缓缓地讲述了他年轻时在国外的经历。

The old man slowly ___unreeled his experiences abroad when he was young.