尽最大努力

The labouring people tried their best to dam the river.

劳动人民大努力筑堤防洪。

We must try our best to reduce the likelihood of war.

我必须大努力减少战争的可能性。

She did her best to smarten her husband up.

大努力把丈夫扮得更英俊。

They did their damnedest to finish on time.

他大努力使(工作)如期完成。