Can't really believe that the pretty good feelings that I have about life, not only can 't be mentioned as perfect without flaws, on the contrary, still have a lot of regrettable flaws.

真没想到，自我感觉不错的生活不但谈不上完美无缺，相反，竟然有这么多缺憾！

youdao

I don't really have the opportunities to study math and science, which, to some degree, I think is regrettable

我没什么机会继续学习数学和科学。我有时觉得有些很遗憾，

文学是灵魂的方式 - SpeakingMax英语口语达人

The British Medical Association says it is regrettable that consultants can't work to see more patients within the NHS instead of seeing them privately elsewhere.

BBC: Health department pays private healthcare firms ?130m

And it is highly regrettable that that veto occurred and that the resolution didn't pass.

WHITEHOUSE: Press Briefing