This allows you to take data from two different source fields and merge them into a single target field.

这允许您从两个不同的源字段获取数据并将它们合并到一个目标字段中。

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Typically, data is copied from the source message into the appropriate field in the target message.

通常，会将源信息中的数据复制到目标信息的合适字段中。

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What are the field specifications of the source data (field name, type, data length)?

源数据的字段规格是什么(字段名、类型、数据长度)？

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