他耐心地把打结的鞋带解开。

He patiently ___unraveled the knotted shoelaces.

科学家们花了多年时间才解开这个古代文明的谜团。

Scientists spent years trying to ___unravel the mystery of this ancient civilization.

随着调查的深入，他们的整个计划开始瓦解。

Their whole plan started to ___unravel as the investigation went deeper.