你确信他在说谎吗？我不相信他会干这种事。

Are you sure he was lying? I can't believe that of him.

《牛津词典》

我确信(睡眠不足和肥胖)有联系，但是不相信科学界可以对此证实。

I'm convinced [sleep deprivation and obesity] are linked, but I don't believe the science has proven it.

youdao

成绩糟糕并且只有初中学历的我并不相信我是个读大学的料，而且我确信甚至在开始之前就会放弃。

Having only completed the ninth grade of school with terrible grades, I didn't believe I was college material, and was convinced I'd drop out before I even started.

youdao

But frankly, I'm convinced, insofar as I'm convinced of anything, that if one doesn't live by that, nothing of any interest is going to happen.

不过，坦率来讲，我相信，或者说，我确信，如果一个人不相信这一点，那么他的艺术创作只会平淡无奇。

普林斯顿公开课 - 人性课程节选

I am convinced--even though I'm sure that the Toyota Motor Company didn't organize it this way— I am convinced that on my automobile when I do not plug in my safety belt that there is a bell ringing "DING, ding, ding, DING, ding, ding."

我相信,尽管我确信,丰田汽车公司不会这样组织,我确信在我车上,当我没有系上安全带的时候,会有响铃,"叮,叮,叮,叮,叮,叮"

耶鲁公开课 - 聆听音乐课程节选