Business logic tier is putted into a.

业务逻辑被封装到一个。

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The majority of the business logic is concentrated on the backend application tier.

业务逻辑的大部分集中在Backendapplication层。

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The majority of the business logic is concentrated on the backend application tier.

业务逻辑的大部分集中在Backendapplication层。

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