客户也可以订阅包含网址或某些特定关键字的消息源。

Customers can also subscribe to feeds of tweets containing web links or certain keywords.

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每一个源文档的关键字持有者文档的数目与每个文档的搜索字段的数目相同。

The number of keyword holder documents per source document is the same as the number of search fields in each document.

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每一个索引文档也具有多值字段unid，其中包含与为该索引文档分配的关键字相匹配的源数据库中的所有文档的UNID。

Each index document also has multi-value field UNIDs, which contain the UNIDs of all documents in the source database that match the keyword assigned for that index document.

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