在活动中可以动态的对片断进行添加，删除，更换或使之呈现动画效果。而且，片断是模块化、可复用的，可以跨越多个活动进行使用。

Fragments can be added, removed, replaced, and animated inside an Activity dynamically, and they are modular and reusable across multiple Activities.

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复杂三维模型的建立、建模工具的灵活使用、三维动画设计方法、多任务控制面板的设计以及计算机考试模块的设计。

It mainly includes building a complex three-dimension model, use of modeling tools, methods of three-dimension movie design, design of multi-task controlling panel and computer testing modules.

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通过使用这些基础构建模块，你就可以迅速创造出更多有趣的东西，没必要像这个动画一样呆板。

And so with these basic building blocks, can you build up much more interesting things and they don't have to be static animations like this.

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