Peter ought to be ashamed of himself.

彼得应为自己感到羞耻。

《牛津词典》

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He knew full well he'd be ashamed of himself later.

他十分清楚他以后会为自己感到羞愧。

《柯林斯英汉双解大词典》

I'm ashamed to be your father. I'd have horsewhipped you if I had a horse.

VOA: special.2009.07.19

Because we can get inspirations from so many places, they come together to make us who we are, and not to be ashamed.

因为我们从各个地方汲取灵感，这些灵感融合在一起，就塑造了我们的人格，我们不应因此感到羞愧。

普林斯顿公开课 - 人性课程节选

? "But why should we be ashamed to praise injustice?"

但为何我们要因为赞美不公而感到羞愧“

耶鲁公开课 - 政治哲学导论课程节选

This controversy does expose some sketchy activity, but its politicians who should be ashamed, not Google.

FORBES: The IRS' Tax Rate On Google's Foreign-Source Income Is 2.4 Percentage Points Too High

Who did I know that I wouldn't be ashamed to ask for a loan?

WSJ: Julia Stiles on Being Broke and Stranded in Havana | Traveler's Tale

What is there to be ashamed of when you are trying to get better?

FORBES: On the Mend: Lessons From the Road to Recovery