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1·Elliott also said that in order to translate what the aliens are actually saying, it may still be necessary to have a code book.

艾略特还说，为了翻译外星人所说的，可能仍然需要一本密码本。

2·This is one realization of the code book.

这是一实现翻书的代码。

3·A. it is very hard to break a code without the code book.

没有密码本的情况下去破解密码是很难的。

4·However, it is also hard to keep a code book secret for long.

然而，让密码本长时间保密，不被他人知道也是很难得。

5·To read the message of a real code, you must have a code book.

想要解读一个真正的密码信息，你必须有一个密码本。

6·With a code book, you might write down words that would stand for other words.

想要解读一个真正的密码信息，你必须有一个密码本。

7·However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

然而，让密码本长时间保密，不被他人知道也是很难得。因此必须频繁更换密码。

8·The computational cost of CELP coding can be reduced more than an order of magnitude by using the populating code book.

通过用繁殖码本，使CELP编码的计算量减少近一个数量级。

9·We introduce the SAR raw data compression coding application with the improved code book and get well experiment effect.

文中还介绍了利用改进的码书对SAR原始数据进行量化编码的应用，得到了较好的效果，并给出了实验结果。

10·A code USES symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book.

一个密码用符号来代替单词，短语或者句子。想要解读一个真正的密码信息，你必须有一个密码本。