Data model: the model used to act as the format to exchange information between the user and the server that provides the information.
数据模型：作为用户与提供信息的服务器之间交换信息的格式的模型。
Data model: the model used to act as the format to exchange information between the user and the server that provides the information.
数据模型：作为用户与提供信息的服务器之间交换信息的格式的模型。
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