徒步小径上有好几个急转弯，让我们不得不放慢脚步。

The hiking trail had several sharp ___switchbacks that forced us to slow down.

过山车的急转弯设计让乘客们尖叫不已。

The roller coaster's sharp ___switchbacks made the passengers scream with excitement.

这条曲折的山路让登山变得容易多了。

The ___switchbacks on the trail made hiking up the mountain much easier.