在这个层中，可以找到所有与数据相关的内容：连接设置、验证参数和关系等等。
Within this layer, you will find everything related to the data: connection Settings, validation parameters, relations, etc.
该层拦截来自用户的请求，然后在后台与服务器通信并异步获得所需的HTTP协议内容。
This layer intercepts requests from the user and in the background, communicates with the server quietly and asynchronously to get the desired content of an HTTP protocol.
在无状态的设计中，必须确保完全由数据层填充对象，并且正确地初始化任何与显示其详细内容有关的延迟加载。
In a stateless design, you must ensure that objects are fully populated by the data layer and that any lazy associations that are needed to show its details are properly initialized.
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