如iPhone用户平均操作成功率为75%，而其它智能手机为55%，普通手机只有38%。

For example, iPhone owners had an average success rate of 75% while other smartphones averaged 55%. Traditional cell phones, however, only averaged 38%.

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循环缓冲区好处是：使共享资源的线程的等待时间减到最小，并使他们的平均操作速度相同。

Circular buffer benefits are: to make a thread of Shared resources to minimize the waiting time, make them the same as the average operating speed.

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生成代码只是为了使常见长度的操作执行得更快，因此平均下来，性能得到了改进。

The code is simply generated to be faster for the commonly observed length so that, on average, performance is improved.

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