"It is a fact,unfortunately, that the word democracy has become a code word in recent years for regime change and maybe for armed intervention regime change, but at the end of the day, there is a core value that Americans have stood for, that we have to continue stand for, and we can't allow that as well to become a fundamental impediment to improving the relations we are talking about."

VOA: standard.2009.04.24

And when we don't see the seed of greatness, when we don't water it and shed a light on it, it withers and dies, which is unfortunately the fate of most human potential.

如果我们看不见学生的潜能，不去栽培它，它就会枯萎而死，遗憾的是，大部分人类潜能都因此而被磨灭。

哈佛公开课 - 幸福课课程节选

You can brute force it and unfortunately, the so-called Caesar cipher is not very secure because if you assume, for our purposes in English alphabet with 26 characters, say all lowercase for all uppercase, my God, you only have to try like 24, 25, 26 possible rotations until you can figure out what his secret message is.

你可以强行解密但是不幸地是，所谓的凯撒密码不是很安全的,因为如果假设，对于我们的26个字符的字母表,指明所有的小写为大写，我的天，你只要试24，25次，26次就可以解答出,密文的内容。

哈佛公开课 - 计算机科学课程节选

.. I guess, unfortunately, it is for... there needs to be a number put somewhere, like, I'm not sure what that number would be, but I do agree that there could possibly be a number put on the human life.

我觉得，不幸的是。,有时确实需要标价，不过我不确定具体数字，但我确实认同,人的生命也许可以被标价。

耶鲁公开课 - 公正课程节选

Unfortunately, this is also call the Rydberg constant, so it's a little bit confusing. But really it means h the Rydberg constant divided by h, and that's equal to 3 .

不幸的是，它也叫Rydberg常数，所以这可能会有点混淆,但它表示Rydberg常数除以。

麻省理工公开课 - 化学原理课程节选