一个有用的技巧是为带句点的词干赋值，这个值将成为基于这个词干的复合名字的默认值。

One useful trick is to set a value for the dotted stem, which then ACTS as a default value for compound names based on the stem.

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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。

The class nltk.stemmer.porter.PorterStemmer is a wonderfully handy tool to derive grammatical (prefix) stems from English words.

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第一部分，主要对“形容动词词干”以及“形容动词词干的词构成”的先行研究进行总结，从而提出问题，明确研究目的。

Mainly summarize the forward research of both verbal stem and its configuration of stative verb, thereby coming up with ideas, specifying the research purpose.

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