Often he teased me till my temper went and I stamped and screamed, feeling furiously helpless.

他过去经常取笑我直到我生气，又跺脚又尖叫，感觉非常无助。

《柯林斯英汉双解大词典》

Later, I developed a broader theory of what separates the two general classes of learners helpless versus mastery oriented.

后来，我发展了一个更广泛的理论来区分无助型学习者和掌握型学习者。

youdao

When I told a group of school children who displayed helpless behavior that a lack of effort led to their mistakes in math, they learned to keep trying when the problems got tough.

当我告诉一群表现出无助行为的学生说，是缺乏努力导致了他们数学上的错误，他们就学会了在问题变得棘手时继续尝试。

youdao

I watched her for hours, helpless and alone with my breaking heart.

VOA: special.2009.07.25

You use "I can't help but" when you feel helpless, when you want to get something across that needs to happen.

当你觉得无助时，或者当你说明需要做到这件事情的时候，你就可以使用“I can't help but”句型。

I can't help but 课堂 - SpeakingMax英语口语达人

"I was helpless, there was nothing I could do, " he said.

WSJ: New Jersey Sorts Through Wreckage

This was flat-out false, and if they believed it I was helpless to explain it.

NEWYORKER: Election, Monitored

"When it happened, in the aftermath, I felt helpless, " he said.

NPR: The Finish Line: What The Bombing Was Like