I could not undestand what he was sorry about, and I just said, "Bye!" After a moment of thinking, I realized how stupid I was.

我不明白他为什么道歉，就说：“再见！”经过片刻的思考，我意识到我是多么的愚蠢。

youdao

I'm sorry I said that. It just slipped out.

抱歉，我说了这样的话，这不过是无意中说出口的。

《牛津词典》

Sorry, Mr.Liu, I didn't understand what you said just now, could you please repeat it?

对不起，刘先生，我不明白你刚才说的什么，你能再说一遍吗？

youdao

I'm sorry? Why did you choose Alpha? Just repeat what you said before.

你不是选了α吗,请再重复下理由

耶鲁公开课 - 博弈论课程节选

And he was speaking with the Natta I just said, "Hi, I'm sorry that you're talking."

他正在和Natta说话,我就说，“你好，很抱歉打扰你们谈话了“

普林斯顿公开课 - 人性课程节选

"I know what they're going through, and I just can't tell them how sorry I am, " she said.

CNN: University shooter's girlfriend: 'I couldn't believe it'

He woke my wife and said, I'm sorry for waking you up but just remember one word--Helmet.

FORBES: Field of Dreams