在任何情况下，这两种理想都难以实现，并且在一个分裂的和不平等的社会中，它们可能直接发生冲突。
This is ambitious in any circumstances, and in a divided and unequal society the two ideals can clash outright.
在这种情况下，优化循环同时发生在模型和实现中。
In this case, the refinement cycles take place in both the model and the implementation at the same time.
这个最佳实践的内涵是：避免服务接口和模式与底层实现和技术之间发生紧耦合。
The best practice is to avoid tight coupling of the service interface and schemas to the underlying implementation and technology.
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