仅使用位图很难实现这种类型的交互性，甚至不可能实现。
This kind of interactivity is difficult, if not impossible, to achieve using bitmaps alone.
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.
ming库是一个php库，其中有一组映射到SWF动画中的数据类型的对象：子图形、图形、文本、位图等等。
The Ming library is a PHP library that has a set of objects that map to the data types in an SWF movie: sprites, shapes, text, bitmaps, etc.
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