If you have some plain text, some message that you want to send, well, you can encrypt it or you can scramble it using a key, a secret key, which might be a physical machine like the Enigma 13 or it might be a number like 13.

如果你有没有加密的文本，你想要寄送的一些消息,你就可以加密它,或者你可以用一个密钥使其变得混乱，那就像一个英格玛的物理装置,或者他就是一个数字。

哈佛公开课 - 计算机科学课程节选

Yet, for all of this, one might say there is still a profound enigma surrounding Aristotle's political works.

但除了上述之外，人们还是觉得,亚里士多德的政治作品仍充满了深奥的谜团。

耶鲁公开课 - 政治哲学导论课程节选

And then, I'm going to skip down a little bit: Though she never again called back any image of the dead man to dress up, pose, talk to and make answer, neither would she lose a new compassion for the cul-de-sac he'd tried to find a way out of, for the enigma his efforts had created.

接下来，我会跳过一些内容往下说：,虽然她从没有想起过，那个死人穿衣、摆弄姿势、,说话和回答问题时的样子，她也不会失去对他的同情，对他尝试摆脱,无路可走的困境所付出的，谜团一般的努力。

耶鲁公开课 - 1945年后的美国小说课程节选