I know there's nothing I can say to make it any easier.

我知道无论我说什么都于事无补。

youdao

I've already written Fitzgerald and Moy, so there's nothing I can say.

我已经给费茨杰拉德和莫埃写了信，所以在此我没什么可说的了。

youdao

I can say in all sincerity that I knew nothing of these plans.

我可以十分坦诚地说，这些计划我一无所知。

《牛津词典》

There is nothing I can say that will fill the sudden hole torn in your hearts.

WHITEHOUSE: President Obama: Memorial in Arizona

Nothing I can say or do will bring these men back.

BBC: Cost cuts blamed for Nimrod crash

There's nothing I can say that can change their opinion.

BBC: Danny Fitzsimons says 'only God' can judge him