以下为句子列表：
英文: Business actions. These organize business logic by procedures where each procedure handles a single request from the presentation layer.
中文: 业务行为.这些组织业务的逻辑处理程序,每个程序一个单一的请求套层.
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英文: Business logic should be in a higher layer of your application. Only data access operations should be permitted.
中文: 业务逻辑应该在你的应用的一个高一些的层次里。持久层里仅仅允许数据存取操作。
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英文: Business rule violations: These could be data entry errors, such as the user entering alpha characters into a numeric field, or they could be more complex business logic issues, such as attempting to delete an order line item for an order that has already
中文: 违反业务规范的错误：这类可能是数据录入的错误，就像把一个希腊字符输入一个数值型的字段中；更或者，所犯的错误违背了业务上的某些准则，比方说试图去删除一个已经发货的订单。
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英文: It separates business logic from presentation and data retrieval.
中文: 它将商业逻辑从表现和数据中分离出来。
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