如果你一定要使用Objective c开发，那你一定要用游戏框架，在游戏编码上会容易很多。
If you do decide to develop in Objective c, it's well worth using a games framework to make coding the game easier.
本文描述的框架提供了编程模型和操作运行时之间的桥梁，使游戏业能够开发受人欢迎的电子商务并且从中获利。
The framework described here provides a bridge between programming models and operational run-times to allow the gaming industry to reap the benefits of becoming an on demand e-business.
游戏开发人员通过访问XNA框架的大部分API，能够针对Zune移动设备进行开发。
Game developers will be able to target the Zune mobile devices by accessing the majority of XNA framework API.
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