The back-end tier is responsible for persisting and manipulating data.
后端这一层负责保存和操作数据。
The data repository tier, or back-end tier, comprises all of the model artifacts and the full structure of the models, which handle integrated business data from all required data sources.
数据存储库层，或后端层包含了所有的人工模型组件和完整的模型结构，它们处理所有必要数据源中的集成业务数据。
The data repository tier, or back-end tier, comprises all of the model artifacts and the full structure of the models, which handle integrated business data from all required data sources.
数据存储库层，或后端层包含了所有的人工模型组件和完整的模型结构，它们处理所有必要数据源中的集成业务数据。
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