redoubling

We redouble our efforts for Manhan’s release.

为了解救马汉,做了最大的努力。

The fox redoubled on its trail to escape the hunters.

那狐狸循原路折回逃避猎人。

When he saw the land ahead, the swimmer redoubled his speed.

那个游泳者看见前面有陆时, 大大加快了他的速度。