We recommend that you install the index data service in the data tier.

我们建议您在数据层安装索引数据服务。

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At the data services orchestration tier, caching is supported by a specialized data caching service.

在数据服务编排层，缓存由专门的数据缓存服务提供支持。

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This includes the UI tier - for identifying objects on which create, read, update, and delete (CRUD) operations will take place - as well as the service and data tiers.

这包括ui层(用来标识要执行创建、读取、更新和删除(CRUD)操作的对象)以及服务和数据层。

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It sets any required HTTP headers and then sends the data to the mid-tier service.

它设置所需的http头，然后将数据发送给中间层服务。

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The other function, sendHttpRequest, is used to send any arbitrary data to the mid-tier service.

另一个函数sendhttprequest用来向中间层服务发送任意数据。

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Spring 2.5 adds two new annotations - @Service and @Controller - to complete the role designations for a common three-tier architecture (data access objects, services, and web controllers).

在此基础上，Spring2.5又加入了两个新的注解 —— @Service和@Controller来完成为通常的三层架构（数据访问对象、服务、web控制器）角色委任。

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Additionally, the presentation layer might communicate with the data access logic in the middle tier through a service such as a service.

此外，展示层可以透过服务(例如，服务)与中介层内的资料存取逻辑进行通讯。

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Additionally, the presentation layer might communicate with the data access logic in the middle tier through a service such as a service.

此外，展示层可以透过服务(例如，服务)与中介层内的资料存取逻辑进行通讯。

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