source-to-target mappings 即从源到目标的转化
Overly detailed source-to-target mappings.
过度详细的数据源到目标的映射。
Target mappings - User is mapping the target to the source, not vice-versa.
目标映射—用户将目标映射到源，反之则不然。
Extension mappings are essentially source-to-target mappings that describe data movement from one or more sources to one or more targets.
扩展映射实际上是源到目标的映射，描述数据从一个或多个源流动到一个或多个目标。
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