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。
Many English words derive from Latin.
许多英语都来自于拉丁语。
Thousands of English words derive from Latin.
英语中有成千上万个词源于拉丁语。
These English words derive from Greek.
这些英文字起源于希腊文。
Thousands of English words derive from Latin.
英语中有成千上万的词源自拉丁文。
Thousands of English words derive from Latin.
英语中有成千上万的词源自拉丁文。
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