它用四种类型的图层来创建动画：矢量、图形、位图以及声音和照相机。

When creating animations it USES four types of layers: vector graphics, bitmap, sound and camera.

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要用PurifyPlus创建快照，只需在Purify工具栏中点击照相机图标。

To create a snapshot with PurifyPlus, just click on the camera icon in the Purify toolbar.

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一个主要缺陷是用这种方法创建的应用程序不能获得本机iPhone的功能，例如加速器、GPS、照相机、通讯录等。

A major setback is that applications built this way can't access native iPhone features like accelerometer, GPS, camera, contacts, etc.

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