用原子核变换方法获得的物质。

Substances obtained by means of nuclear transformation.

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应用快速傅立叶变换方法对脉搏信号进行了分析。

The pulse signals were processed by using the fast Fourier transforms.

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最后，通过实际例子验证这种采样率变换方法的有效性。

Finally, this sampling rate alteration method is proved to be efficiency with examples.

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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