相反，在正向索引中，文档占据了中心的位置，每个文档指向了一个它所包含的索引项的序列。
Each term points to a list of documents that contain it. On the contrary, in a forwarding index, documents take the center stage, and each document refers to a list of terms it contains.
根据这个预期的重点，我选择查询结果的粒度时以同义词组的序列化为中心。
According to this expected emphasis, I've chosen the granularity of the query results to center around serializing synsets.
在分析Lucene的索引文件结构之前，我们先要理解反向索引(Inverted index)这个概念，反向索引是一种以索引项为中心来组织文档的方式，每个索引项指向一个文档序列，这个序列中的文档都包含该索引项。
Before analyzing Lucene's index file structure, you should understand the inverted index concept. An inverted index is an inside-out arrangement of documents in which terms take center stage.
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