开车的话需要走一段非常蜿蜒曲折的下坡路。The drive required going down a quite twisty road.蜿蜒曲折的河道the serpentine course of the river漫长而曲折的和平谈判过程the long, tortuous process of negotiating peace...

“曲折的”的英语可以翻译为：labyrinthian，meandering，[法] indirect，tortuous，devious ...