These abstraction layers give developers the option to use a declarative syntax based on attributes or an imperative model based on nested controls.

这些抽象层让开发人员可选择是使用基于特性标记的声明语法，还是使用基于嵌套控件的命令模型来开发。

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So while any of the delivery models seen for QA delivery can work, the option based on automated tests is by far the most successful model.

因此，虽然QA交付中的多种交付模式都可以运作，基于自动化测试的方式目前是最成功的模式。

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After the import process, each subunit imports as a new fragment, model, or root package based on the option you specified.

在导入过程完成之后，每一个子单元都会基于您所指定的选择，而作为一个新的片段、模型或者根包来导入。

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