听到这个消息，琼感到很难过。

Jo felt sad when she heard this.

youdao

事实上，我感到很难过。

I'm feeling rather sad, actually.

youdao

我忘了她的生日，感到很难过。

I feel awful about forgetting her birthday.

《牛津词典》

People did say they were happy to have participated and only 2% said that they were sorry, but still serious damage could have been done and perhaps was done.

但确实有人说他们很高兴能参与实验,只有2%的人说他们感到难过，但这个实验可能对电击者造成严重的伤害,也许已经造成了。

耶鲁公开课 - 心理学导论课程节选