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。
Only documents relating to the same application shall be included in one letter.
一件信函中应当只包含同一申请的文件。
Only documents relating to the same application shall be included in one letter.
一件信函中应当只包含同一申请的文件。
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