Interactions between application layers.

不同应用程序层间的交互。

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A gap exists between the business and application layers.

业务和应用程序层之间存在着鸿沟。

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No knowledge of SQL is required to develop the other application layers.

开发其他应用程序层时，不需要 SQL 方面的知识。

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Suddenly, your application and data layers look out of balance again.

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With this API in place we'll be able to decouple the presentation and data layers of the application and build a new, streamlined signature process.

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He explained to me that his central realization was that he had to control the relationships between the different layers of the application stack in order to make sure that it could reliably deliver smooth movement.

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