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

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