I don't play the currency market, unfortunately, because currency has gone down so much.

很遗憾我没有企图在货币市场上牟利，因为货币市场最近跌幅巨大。

耶鲁公开课 - 金融市场课程节选

that something you that you either did or did not do but should have done.

为一些你之前做过的或是本该做却没有做的事情表示遗憾。

I should have 课堂 - SpeakingMax英语口语达人

The third derivative, unfortunately, was never given a name, and I don't know why.

遗憾的是三阶导数没有专门的名称,我也不知道这是为什么

耶鲁公开课 - 基础物理课程节选

And from the fact, even if we were to agree with it, that it would've been better if we hadn't been born-- instead of feeling sorry for unborn Larry, Larry perhaps we should envy unborn Larry; that's what the pessimists say-- even if that were true, it wouldn't follow that suicide was an appropriate response.

从这个事实讲，即使我们同意，我们没有出生更好-,与其为没出生的Larry感到遗憾，也许我们应该嫉妒未出生的;,这正是悲观主义者的观点-,即使这是对的，也得不出自杀是适合的回应的结论。

耶鲁公开课 - 死亡课程节选