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.
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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