The fox redoubled on its trail to escape the hunters.

那狐狸循原路避猎人。

We retraced our steps to where we started.

我们我们出发的地方。

You might find your ticket if you retrace your steps back to the car.

如果原路到车子那里 ，就有可寻你的票。

The dog doubled on its tracks .

狗急忙跑。