The basic extension contains very simple elements: one word and, of course, a new synonym.
基本扩展包含非常简单的元素：一个词，当然，还有一个新的同义词。
To make the new annotations available with keyword search, the synonym dictionary for this collection must be extended.
为了让关键字搜索可以使用新的注释，必须扩展这个集合的同义词词典。
The jackrabbit-core component has been extended with new features like configurable indexing, synonym and similarity queries, and spell checking.
jackrabbit - core组件扩展了一些新特性，比如配置索引、同义词和相形词查询以及拼写检查。
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