Running the engine or compiler for the presentation technology converts it to the proper format, and no code changes have to be made (in the typical case).

运行表示技术的引擎或编译程序将标记页面转换为适当的格式，并且不需要修改任何代码(典型情况下)。

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For example, a PHP script might use a template engine to separate business logic from the presentation, and be considered two separate tiers.

例如，php脚本可能使用一个模板引擎把业务逻辑与表示分隔开，它可以被看作单独的两层。

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The ability to use PHP to move freely between the business logic layer and the presentation layer (using the PHP template engine) was also very appealing.

为了在业务逻辑层和表示层之间自由地移动(使用PHP模板引擎)，还需要掌握PHP。

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Esser highlighted the success of the recommendation engine during the presentation.

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