对这种虐待感到无能为力是自然的。

It's natural to feel helpless against such abuse.

《牛津词典》

家长们常常感到无能为力，知道世上所有的拥抱也不能止住眼泪。

Parents often feel helpless, knowing that all the hugs in the world won't stop the tears.

《柯林斯英汉双解大词典》

我对他一无所知，我感到无能为力。

I knew nothing about him, and I felt totally helpless.

youdao

I had made him know that I felt he was cruel and I had done it without his punishing me.

同时，我让他感到了自己的残忍,对此他无能为力。

耶鲁公开课 - 1945年后的美国小说课程节选