流程模型中的网关形式和活动形式可以互换使用，如本文第1部分中的背景部分所述。

You can use gateway form and activity form interchangeably for process models that contain only control flow, as we discussed in the Background section in Part 1 of this article.

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现在，您已具备了WebSphere Portal内容模型的一些背景知识，并了解了如何将SPI与该模型一起使用，接下来让我们看一看如何创建动态用户界面。

Now that you have some background in WebSphere Portal's content model and have seen how to use the SPI to work with it, let's look at how to create dynamic user interfaces.

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在此基础上，使用动态图像处理技术中的二维运动估计技术，结合背景更新模型提出了一种车辆跟踪算法。

On this basis, combined with one sort of background updating model, vehicle tracking algorithm is presented through using two-dimension motion estimation technique in dynamic image processing.

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