The class nltk.stemmer.porter.PorterStemmer is a wonderfully handy tool to derive grammatical (prefix) stems from English words.
PorterStemmer 类是一个用于从英文单词中 获得符合语法的（前缀）词干的极其便利的工具。
From I like English and I can often derive enormous pleasure from learning it.
我喜欢学英语，经常能从学习中获得极大的乐趣。
Many English words derive from French.
许多英语词汇源自法语。
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