《自动机理论、语言和计算导论》学习第4天，p68-p114总结，总计47页。

一、技术总结

1.inverted indexes

明白单词的意思是“反转的索引”，但是不明白其在书中具体指什么，去查询资料的话需要花很不多时间，先继续往下看。遇到这种场景的可能性还是比较多的。

2.lexical analysis

(1)lexicon: c. a list of all the words used in a particular language, or a dictionary。

(2)lexical: lexicon + al。adj. relating to words。

(3)lexical analysis: 词法分析器。

二、英语总结

1.analyst

c. a person whose job is to study sth in detail, in order to discover more about it and often to make predictions。

2.stock ticker symbols

(1)stock: part of the ownership of a company that can be bought by memembers of the public.

(2)ticker: c. a moving area on a screen that show changing information such as news or stock prices。

(3)symbol: c. anything used to represent sth else。

stock ticker symbols: Stock ticker symbols are shorthand codes used to uniquely identify publicly traded companies on stock exchanges. egg：

Apple Inc. - AAPL

Alphabet Inc. (Google) - GOOGL

3.spontaneously

(1)spontaneity > spontaneous > spontaneously

(2)spontaneity: u. the quality of being natural rather than planned in advance。

4.resemblance

(1) resemble > resemblance

(2)resemble: re-(intensive form) + sembler(be like)

(3)resemblance: c/u. state or property of being like。

p85, They have significant resemblance to the algebraic laws of arithmetic, yet there are also some important differences between the algebras of regular expressions and arithmetic expressions。没查resemblance意思之前，自己之所以不理解这句话是因为significant 不理解，一直记住的是“有重大意义的（having a specical meaning）”，其实也可以单纯的表示“large, great”之意。

三、其它

如果不是带着疑问看技术类书籍，那么看久了就会陷入一种“迷茫”的状态，不知道自己看这些有没有用，不知道哪些应该精读，哪些应该略读，也不知道这些会应用在哪里。这就是“自底向上”的难处，不知道一下步是正确的还是错误，不知道和后续的是否有关联，唯一要做的就是把书看完，把事干完。只有读完了才知道哪些是自己需要的。

四、参考资料

1. 编程

(1)Eric S.Roberts，《自动机理论、语言和计算导论(英文版.第3版)》：https://book.douban.com/subject/2274854/

2. 英语

(1)Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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