无济于事

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

他竭尽了全力却于事。

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

光发于事，我们必须采取行动。

All his efforts avail to nothing.

他的一切努力都于事。

Nothing will help.

一切均于事。

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

居民们试图抵制移居到另一座城市去, 但于事。