这样的搜索会作为一个短语搜索，所以包含搜索词汇变形的文档不会返回。
The search is applied as a phrase search, so documents that contain an inflection of the search term are not returned.
搜索基本形式会返回所有的变形词，包括所有格 s 的词汇，如清单 9 所示。
Searching for the base form returns all inflections, including terms with possessive s, as shown in Listing 9.
将词汇包含在双引号中能够排除这个词汇的变形，以及同义词和其他有相同词元的词汇。
Enclosing the term in double-quotes excludes variations of the term and excludes synonyms and other terms with the same lemma.
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