To retrieve only documents that match the term, but not those that match the lemmas, enclose the term in double quotes.
要查询只与这个词汇相匹配而不与词元相匹配的文档，需要给这个词汇加上双引号。
Search within a category: you can select a category and then search only documents that are both within the category and that match your query.
在目录中进行搜索：可以选择一个目录，然后只在这个目录中寻找与查询匹配的文档。
Search within a category: you can select a category and then search only documents that are both within the category and that match your query.
在目录中进行搜索：可以选择一个目录，然后只在这个目录中寻找与查询匹配的文档。
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