迷路时，原路返回是明智的。

When lost, it's wise to ___retrace ___your ___steps.

通过 mentally 原路返回，他发现了计算中的错误。

By mentally ___retracing ___his ___steps, he found the error in his calculation.

徒步旅行者意识到走错路后，不得不原路返回。

The hikers had to ___retrace ___their ___steps after realizing they were on the wrong trail.