优点：全新的设计，更好的显示效果，支持多任务处理的新操作系统，待机时间长，内置陀螺仪改进游戏体验，能进行视频通话的Facetime功能
Pros: Refreshed design, with much improved display; new operating system introduces multi-tasking; battery life improved; new gyroscope improves game-playing; video calling with Facetime.
在实时系统中，多任务运行时间是选择算法的一个关键因素。
In real time system, the run time of multitask is one of the key factors in selecting the algorithms.
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