无济于事

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

他竭尽了全却无济于事。

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

光发愁无济于事，我必须采取行动。

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

居民抵制移居到另一座城去, 但无济于事。

All his efforts avail to nothing.

他的一都无济于事。