In the electrotechnics basis theory, it's very convenient to solve one branch's voltage and current by the equivalent transformation between the voltage source and current source.
利用电压源与电流源之间的等效变换求解某一支路电压、电流，是电工基础理论中非常方便的方法。
If a transformation fails, then the source row is in error, and that row is written to the source error rows file.
如果转换失败，则源行有错误，该行会写入到源错误行文件。
Staging Engine implements data mapping and transformation. Triggered by BW Scheduler, it sends requests to a source system for data loading. The source system then selects and transfers data into BW.
数据加载引擎执行数据映射与转换，并被BWScheduler触发，它发送加载数据的请求给源系统，然后源系统选择数据并传输到BW。
Then introduced the transformation process that from the source code to the abstract data model. Focus on the code extraction patterns and the analysis of the system source code process.
之后介绍了源代码向抽象数据模型的转化过程，重点阐述了代码抽取模式和系统源代码分析过程；
Then introduced the transformation process that from the source code to the abstract data model. Focus on the code extraction patterns and the analysis of the system source code process.
之后介绍了源代码向抽象数据模型的转化过程，重点阐述了代码抽取模式和系统源代码分析过程；
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