我已从痛苦的经验中得到了教训，不要相信他的话。

I've learnt from bitter experience not to trust what he says.

《牛津词典》

看牙医会是个痛苦的经验。

Visiting the dentist can be a painful experience.

youdao

那对我来说是痛苦的经验。

It was a distressing experience for me.

youdao

In many ways you can look at most of our experiences, psychological effective experiences on a continuum, where some of them fall below the zero, the negative experiences or the painful experiences and the positive or the pleasurable experiences between the zero and the positive.

可以从多方面来看我们的经验，在心理连续谱上看有效心理经验，有时候会跌倒0以下，不愉快或痛苦的经历,积极或愉快的经历,分别在0与正值之间。

哈佛公开课 - 幸福课课程节选