In the count example program, a stem variable maps a word to the number of times that word occurs.

在count示例程序中，它使用一个stem变量将单个字映射到该字的出现次数。

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Then modify the program to count the total number of words in the book, and the number of times each word is used.

然后再修改一下程序，让程序能统计一下整本书的总单词数目，以及每个单词出现的次数。

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I started to write a little program with Python to count the frequency statistics for each single word.

后来，我开始使用python编写一个用于统计词频的小程序。

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Instead, Facebook feeds any political commentary in status messages into a text analysis software program, the Linguistic Inquiry and Word Count, which determines whether what you said was positive or negative.

FORBES: From Now On, Your Political Musings On Facebook Are Being Mined