无济于事

He poured in every ounce of power but couldn't make it.

他竭尽了全却济于事。

It’s no use just wringing our hands—we must do something.

光发愁济于事，我必须采取行动。

The habitants tried to fight against being moved to another city, but it was no use.

试图抵制移到另一座城去, 但济于事。

All his efforts avail to nothing.

他的一切努济于事。