This is necessary to isolate the relational layer from the object layer, but this convenience comes at the cost of performance.
这对于将关系层与对象层分离是必需的,但这种便利是以牺牲性能为代价获得的。
Moving up a layer has a cost in terms of adopting certain practices in development, build, and operations, but also has benefits.
就开发、构建和运营时所采用的具体实践来说,升级到上一层会有成本,但也会有好处。
The inclusion of such a layer involves an additional up front development cost.
包含这样一个层涉及了额外的早期开发成本。
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