“不遗余力”，汉语成语，意思是把所有力量都使出来，一点也不保留，形容用尽全力做事。与英文短语“spare no effort”意思相近，表示“do everything one possibly can in order to achieve something”。也可以翻译为“ make the best of one's way，do one's utmost”。

例句：

我们应该不遗余力地保护环境。

We should spare no effort to protect our environment.

我们不遗余力地提供帮助。

We did our utmost to help.