This is a key to his character; these two episodes are the two that we're given of Moses' life.

这也是他性格的一大特点;,这是我们所看到描写摩西生平的两个片段。

耶鲁公开课 - 旧约导论课程节选

And the key to his strength,besides the church,are the nobles.

而除了教会,他的力量关键要靠贵族

耶鲁公开课 - 1871年后的法国课程节选

It's a secret number so that if Julius Caesar scrambled his message with the key 13, well, then the recipient had better know what that number is or realistically, -- and this is why it's kind of hard to buy -- into some of these age old algorithms, -- what would an alternative approach be to figuring out Julius Caesar's messages to his generals if he didn't know that secret number was 13?

它是一个机密的数字，以至于,如果凯撒大帝使用密钥13加密了它的消息，然后接收者最好知道那个数字是什么,实际上--这就是为什么很难,破解这些古老的算法-,有什么变换方法使凯撒大帝的将军,可以解密凯撒大帝的消息，如果他不知道,那个机密数字是13呢？

哈佛公开课 - 计算机科学课程节选