调查人员为寻求真相而不遗余力。

The investigators ___leave no stone unturned in their pursuit of the truth.

为了达成她雄心勃勃的目标，她竭尽了全力。

She ___left no stone unturned in her efforts to achieve her ambitious goals.

救援队承诺，在找到失踪的徒步旅行者之前，他们将竭尽全力。

The rescue team promised to ___leave no stone unturned until the missing hiker was found.