complementary data
数据互补 data complementation
互补分级数据组织 Complementary Grade Spacial Data Structure
互补分级数据模型 Complementary grade data model
当接收到的请求数量适中，而来自多个异类互补数据源的结果大小有限时，可最佳地利用数据联合的优势。
The advantage of data federation is best exploited when a modest number of requests are received against limited result sets sized from multiple consistent, complementary data sources.
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