Data is typically stored in many different data storage systems, and extracting data from all sources and merging the data into a single, consistent dataset is challenging.
数据通常存储在很多个不同的数据存储系统中，从所有源中提取数据并将其合并到单个一致的数据集中确实有一定的难度。
Data is typically stored in many different data storage systems, and extracting data from all sources and merging the data into a single, consistent dataset is challenging.
数据通常存储在很多个不同的数据存储系统中，从所有源中提取数据并将其合并到单个一致的数据集中确实有一定的难度。
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