She found him sleeping heavily, and all her efforts to awaken him were of no avail.

她发现他睡得很沉，她想唤醒他的一切努力都无济于事。

youdao

Now it's done, regrets are of no avail.; It's no use crying over spilt milk.

事已如此， 后悔也是枉然。

《新英汉大辞典》

The advice we got was of no avail.

我们得到的这个建议根本没用。

youdao

"After the dissuasion by means of whistle-blowing, shouting and hand-flag guiding was of no avail, the Chinese naval vessels fired two red signal shells into the sky as a warning, and the signal shells burned out and extinguished in the air, " Xinhua quoted the official as saying.

BBC: China 'fired flares' at Vietnam boat in South China Sea

Birmingham immediately produced a spell of pressure to no avail, while Pompey grew in confidence and authority.

BBC: Birmingham 0-2 Portsmouth

Businessman Pong Salud, another guest, takes me aside and tells me that some friends gave Estrada three sets of golf clubs to no avail.

CNN: DAYS OF THEIR LIVES